How to make a Rainbow Layer Cake using white chocolate mud recipe

Rainbow Cake
Rainbow Layer Cake

This cake is similar to my Rainbow Cake below and you can find full instructions for it here.

Rainbow Cake
Rainbow Cake

Three things make this cake special

1. The Rainbow Layers. They can be a big surprise if the recipient and/or guests have no idea what is inside.

2. The cake is based on a White Chocolate Mud Cake. Lots of people are scarred to use colours with Chocolate mud cakes if they do not have the special chocolate colours. I did a lot of research before I used my ordinary food colours and the reason they work is because we are not colouring 100% pure chocolate. The other ingredients magically make it alright to use Wilton or AmeriColor (these are the only two makes that I have tried so far).

3. You can make this cake even if you do not have 6 x 10″ round cake pans. I have 2 x 10 inch pans and I bake the layers in 3 batches. You could make do with just one pan, it will just take a little longer.

Colours of the rainbow
Colours of the rainbow Red, Orange, yellow, green, blue and purple.
Coloured cake batter
Coloured cake batter
Use 2 x 10 inch pans
Use 2 x 10 inch pans

White Chocolate Mud Cake 

(Planet Cake recipe)

Need a minimum of one 10″ pan ( 6 x 10″ pans would make the job really easy though!)

I used 2 x 10″ pans as that is all I have.

390g butter
390g white chocolate
350ml water
195g SR flour
390g plain flour
520g caster sugar
4 eggs, lightly beaten
2 tsp vanilla essence

White Chocolate Mud Cake Method

  1. Preheat the oven to 150C.
  2. Grease and line bases of both cake pans with one thickness of baking paper.
  3. Combine chopped butter and water in a saucepan.
  4. Stir over low heat until butter is melted. Turn off heat, then add the chocolate and stir until it has melted and is well combined.
  5. Sift flours into a bowl. Add sugar, a pinch of salt and make a well in the centre.
  6. Pour chocolate mixture, egg and vanilla into the well then stir with a wooden spoon until well combined.
  7. Divide the batter equally amongst the 6 bowls.  Weigh your mixing bowl before you begin adding ingredients and then subtract the weight of the bowl from the final measurement after the batter is completed. Divide that number by six and add that weight of batter to each bowl, and then whisk a fair amount of the appropriate food color into each bowl. Keep in mind that the color of the unbaked batter will be the color of the baked batter. Pour into the pans and bake for 15 minutes each or until a skewer comes out clean when poked into the middle of the cake.
  8. Once cake pans have been washed, repeat the process twice more till all 6 layers have been baked.

 

Rainbow layers ready for buttercream
Rainbow layers ready for buttercream

Lemony Swiss Meringue Buttercream

As you can see from the recipe, this cake requires a huge amount of buttercream to fill the layers and cover the outside. I would recommend that you make the buttercream in two separate batches ( 1. To fill and crumb coat. 2. To frost) because you would need a HUGE bowl to make this much buttercream at one time!

Please click here for a step-by-step guide to making Swiss Meringue Buttercream and troubleshooting tips!

To fill and crumb coat:

9 egg whites
1 ¾ cup (350 g) sugar
4 sticks (452 g) butter, room temp
2 tsp lemon extract

To frost:

5 egg whites
1 cup (200 g) sugar
2 sticks (226 g) butter, room temp
1 tsp lemon extract

Cook the egg whites and sugar in a small saucepan over medium heat, whisking constantly, until the sugar is completely dissolved (test by rubbing some between your fingers. If it’s completely smooth, it’s done). Pour into another bowl (a stand mixer is preferable) and whip on high speed until room temp. Then, on a medium-slow speed, add the butter, waiting until each piece is completely incorporated before adding the next. After all the butter has been added, turn the mixer back to high speed and whip until it has come together, about five minutes. Add the extract, beat briefly and then use.

If the buttercream seems soupy after all of the butter is added and does not come together after whipping, refrigerate for 5 to 7 minutes and continue whipping until it becomes fluffy and workable.

Filled with buttercrem
Filled with buttercrem

Assembly

Stack the layers in your preferred order and fill and frost as you would any other cake.

Once frosted, the cake can be left on the counter without any problems, but feel free to refrigerate it. Just be sure that the cake is at room temperature when serving or the frosting will be hard.

A slice of Rainbow Cake
A slice of Rainbow Cake
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Pink Tatty Teddy Christening Cake Tutorial

7” White Chocolate Caramel Mud Cake Round
Ingredients
180g butter
180g white choc
162ml water
90 SR
180g plain
120g caster
120g soft brown sugar
2 eggs
1 tsp vanilla
250g nestle Top’n’Fill Caramel
Ganache
780g white chocolate
270ml pure cream
Fondant
780g sugar-paste
Method for the 7″ round white chocolate Caramel mud cake 
(adapted from Planet Cake Cookbook)
Preheat oven to 180C. Grease tin and line the base and sides with a collar of baking paper that extends 2 cm above the top of the tin. Add baking strips (made from damp cloths wrapped in tin foil) around the outside of the cake tin. Put the butter and water in a saucepan over medium heat and stir until butter has melted. Turn off the heat, then add the chocolate and stir until it has melted and is well combined.
Sift the flours together in a bowl. Add the sugars, a pinch of salt and make a well in the centre.
Pour the chocolate mixture, egg and vanilla into the well then stir with a wooden spoon until well combined. Add Top’n’Fill and stir till combined
Pour into the cake tin inserting a flower nail in the bottom of the tin. Bake for 1 hour 20 minutes or until the cake is golden brown and a skewer comes out clean when poked into the middle of the cake. Cover with foil halfway through if the cake is browning too quickly.
Once removed from the oven, use a pastry brush (or similar) to brush the top of the cake with boiled water to keep it moist and save it from cracking and forming crusty bits on top. Then cover with a clean tea cloth to reduce evaporation. Repeat the brushing with boiled water step two or three times at half hour intervals as the cake cools. Remove the baking strips once they can be handled or use oven gloves to remove them.

Let cake cool completely on a wire rack before taking the cake out of the tin.

Wrap the cake well in cling film (do not squash cake) and put in fridge till morning.
  1. Process chocolate till it resembles breadcrumbs and place in a large bowl
  2. Put the cream in a saucepan and bring to a rolling boil. Pour the cream over the chocolate and mix with a hand whisk until the ganache is smooth. (Do not use an electric whisk, as you will create too many air bubbles in the ganache.)
  3. Allow to cool completely and then leave to set overnight.

To torte and cover your cake with ganache click here

To make the teddy. Colour white ready made sugar paste with pink gel colour and add half a teaspoon of Tylose powder and kneed till incorporated. Model all the little bits and pieces in the picture above and leave to harden for an hour or two.

Use dark pink petal dust to brush onto the Teddy’s cheeks with a dry paint brush. Use wooden cocktail sticks to attach arms, legs and head to body along with edible glue made from water and Tylose powder. Use the same method to attach the finished Teddy to the cake.

 
 
 
 
 

Pink Tiffany Wedding Cake Tutorial

This cake was made up of two square tiers. The bottom tier was an 11″ dark chocolate mud cake with dark chocolate ganache and the top tier was a 9″ white chocolate mud cake with white chocolate ganache.

Ingredients for the 9″ square white chocolate mud cake

400g butter

400g white chocolate

350ml water
400 plain flour
200g SR flour
520g caster suger
4 eggs
2 tsp vanilla

White chocolate ganache

1700g white chocolate
600ml pure cream
Fondant
1700g sugar-paste

Method for the 9″ square white chocolate mud cake 

(adapted from Planet Cake Cookbook)
Preheat oven to 180C. Grease tin and line the base and sides with a collar of baking paper that extends 2 cm above the top of the tin. Add baking strips (made from damp cloths wrapped in tin foil) around the outside of the cake tin. Put the butter and water in a saucepan over medium heat and stir until butter has melted. Turn off the heat, then add the chocolate and stir until it has melted and is well combined.
Sift the flours together in a bowl. Add the sugar, a pinch of salt and make a well in the centre.
Pour the chocolate mixture, egg and vanilla into the well then stir with a wooden spoon until well combined.
Pour into the cake tin, Bake for 1 hour 45 minutes or until the cake is golden brown and a skewer comes out clean when poked into the middle of the cake. Cover with foil halfway through if the cake is browning too quickly.
Once removed from the oven, use a pastry brush (or similar) to brush the top of the cake with boiled water to keep it moist and save it from cracking and forming crusty bits on top. Then cover with a clean tea cloth to reduce evaporation. Repeat the brushing with boiled water step two or three times at half hour intervals as the cake cools. Remove the baking strips once they can be handled or use oven gloves to remove them.

Let cake cool completely on a wire rack before taking the cake out of the tin.

Wrap the cake well in cling film (do not squash cake) and put in fridge till morning.
Method for white chocolate ganache

  1. Process chocolate till it resembles breadcrumbs and place in a large bowl
  2. Put the cream in a saucepan and bring to a rolling boil. Pour the cream over the chocolate and mix with a hand whisk until the ganache is smooth. (Do not use an electric whisk, as you will create too many air bubbles in the ganache.)
  3. Allow to cool completely and then leave to set overnight.

Ingredients for the 11” square dark chocolate mud cake 

440g butter
440g dk choc
50g coffee
320ml water
250g SR flour
250g plain
100g cocoa
1 tsp bicarb
960g caster
8 eggs
14 tsp oil
200ml buttermilk

Ganache

2400g dark chocolate
1200ml pure cream

Fondant

2.6kg sugar-paste
Method for the 11” square dark chocolate mud cake 
Preheat the oven to 160C. Grease the tin and line the base and sides with a collar that extends 2 cm above the top of the tin. Add baking strips (made from damp cloths wrapped in tin foil) around the outside of the cake tin.

Put the butter, chocolate, coffee and water in a saucepan and stir over low heat until melted, then remove from the heat.

Sift the flours, cocoa and bicarbonate of soda into a large bowl. Stir in the sugar and make a well in the centre. Add the combined egg, oil and buttermilk and the chocolate mixture, stirring with a large spoon until completely combined.

Pour the mixture into the tin and bake for 2 hours (for 11.5″cake) or until a skewer poked into the centre of the cake comes out clean, though it may be a little sticky.
Once removed from the oven, use a pastry brush (or similar) to brush the top of the cake with boiled water to keep it moist and save it from cracking and forming crusty bits on top. Then cover with a clean tea cloth to reduce evaporation. Repeat the brushing with boiled water step two or three times at half hour intervals as the cake cools.
Remove the baking strips once they can be handled or use oven gloves to remove them.

Let cake cool completely on a wire rack before taking the cake out of the tin.

Wrap the cake well in cling film (do not squash cake) and put in fridge till morning.
  1. Process chocolate till it resembles breadcrumbs and place in a large bowl
  2. Put the cream in a saucepan and bring to a rolling boil. Pour the cream over the chocolate and mix with a hand whisk until the ganache is smooth. (Do not use an electric whisk, as you will create too many air bubbles in the ganache.)
  3. Allow to cool completely and then leave to set overnight.

Making the lids

Let the cakes sit for a couple of hours to allow the icing to dry before you make the lids.
Brush the top of the cakes with a little water (or syrup) and run the brush around the top inch of the side of the cakes.
Knead 400g of the pink icing for the top box lid and 600g of pink for the the bottom box lid.
Once the dough is pliable, roll out each piece till they are at least 8 in larger thad the width of each box. Roll the icing over your rolling pin, lift it up and roll it over the cake. Smooth the top and sides with a flexi-scraper. Use a ruler to mark the edge of the lid on all 4 sides.
Trim the lid with a sharp knife.

Making the ribbon

Knead 500g of the white sugar-paste to a pliable dough and roll out to 16 x 40 cm rectangle. Cut into 4 long 4 cm wide strips. Trim one end of each ribbon into a point to help fit the ribbons together on top of the cake. Stick to the cake with water and trim excess ends with a knife.

Making the bow

Instructions on making the bow can be found on this video.

How to make Ganache and cover your cake with it

I love using ganache to cover cakes and wedding cakes as it tastes incredibly delicious and it’s so much easier to get nice, straight sides and edges compared to buttercream. Ganache is also wonderful to use under sugar-paste for the same reasons. Living as I do on the Gold Coast, Australia, ganache is the obvious choice as it withstands most of our really hot weather MUCH better than buttercream.
Chocolate and cream are the only two ingredients in ganache and are used in a 2:1 ratio for dark and semi-sweet chocolate and the 3:1 ratio for milk chocolate. The wedding cake in the picture above was covered in white chocolate ganache using the ratio 3:1 i.e. 3 parts white chocolate to 1 part cream.
In extremely warm weather it is sometimes necessary to increase the amount of chocolate in the mixture to prevent it melting.
To torte and cover a 9″ round cake with dark chocolate ganache
Ingredients:
1.75 kg dark chocolate
600ml pure cream
To torte and cover a 9″ round cake with white chocolate ganache
Ingredients:
1.3 kg
450ml pure cream
If you prefer a really soft filling for your cakes then just whip ½ cup cream and add 2 tbsp of the Ganache and whip a little more. This makes a delicious and easy chocolate mousse.
Step 1Make the Ganache: Heat the cream until it just starts to bubble, pour over chocolate (which you have blitzed in the food processor to coffee granules size) and let it sit for about a minute to melt. Use a hand whisk to blend it all together then set aside to cool. 
Your ganache at this point will be thin. You will have to pop it in the fridge until it thickens to a slightly thicker peanut butter consistency (don’t cover because you might get condensation). It would  usually set in the fridge in about an hour or two. If it sets too hard, just microwave it in 10 second intervals (keep mixing it whenever you take it out).
Proccess the chocolate to the size of coffee granules
Proccess the chocolate to the size of coffee granules
 Ganache nice and smooth

Ganache nice and smooth
Cutting cake into layers. Keep original layer of greaseproof paper on as long as possible to keep cake intact add a board or metal base to the top of the cake when cutting as you may accidentally put pressure on the top of the cake when cutting and dent your nice flat top.
Cut out a circle of non slip matting
This will stop your cake moving about on top of the turntable
Step 2Torte and level the 9″ cake: Place cake upside down on the cake board on a layer of ganache to act as a glue and to even out any irregularities. Add a mound of ganache in the middle of the board if your cake sunk or add a ring of ganache round the edge if you cake was high in the centre. If you are using the soft filling then pipe a ½” snake of Ganache around the outside edge of the cake to create a dam, pop the cake into the fridge for the dam to harden (about 5 min) remove from fridge, then fill with the filling. If using regular ganache to fill then apply with a cranked handled palette knife if you have one.
Top with the next layer of cake and repeat if needed. 
 
Step 3Crumb coat: (optional) Cover sides and top of cake quickly with a thin coat of ganache to stop crumbs getting into your final coat of ganache. This is useful especially if your cake is more crumbly than normal. Put in fridge for an hour or so to harden before continuing. 

Applying a quick crumb coat
A set square helps me get perpendicular sides
Crumb coat complete
Step 4Cover the top of the cake with Ganache: I like using the ‘double board’ method to get the top edge of the cake perfectly smooth. Top the cake with a 1/2” layer of Ganache, smooth it out then place a 9″ board on top which has been completely covered on both sides with cling film to keep the board clean and reusable and secured with sticky tape. Check with a small spirit level to see if it’s leveled, if not, gently press down around the cake until it is.
 
Step 5Cover the sides of the cake with Ganache: You want to always add more ganache than you need at the beginning because it is so much easier to just scrape off the excess and be done rather than to keep adding then scraping then adding then scraping…etc. As the 9” cake board is slightly larger than the cake (9” cake shrinks a little after cooling). I use the edge of the two boards as a guide to the thickness of the Ganache. Once you have added the Ganache along the sides, use a metal scraper or similar tool, to scrape the excess off a little at a time, layer by layer as you turn the turntable.
Step 6: Place the cake into the fridge for at least a ½ hour, remove, then carefully undo the cling and lift off the board then carefully peel the cling film from the top of the cake. You may need to smooth away the little imperfections or fill any air holes with a little bit of Ganache.
I went straight ahead and covered these 4 cakes with sugar-paste but I could have used a hot palette knife to smooth out any remaining imperfections if the cakes were not being covered,

Step 7: Let the cake sit overnight at room temperature for the Ganache to completely set. If you live in a hot climate like I do then best to put it in the fridge overnight. A wine fridge is best (as it is not so cold as your normal fridge in the kitchen) and has a built in humidifier. The cake will get quite hard and cold overnight and it is important that the cake gets back to room temp before covering with sugar-paste.( If you do not allow your cake to reach room temp, all the way through, the cake will sweat through your sugar-paste!) Before covering you can either brush or spray the cake with a little bit of water or vodka (it evaporates away anyways) or some type of syrup (apricot jam diluted with water). 

 
The above recipes make more ganache than is needed so that there is enough to allow for mistakes and for putting on extra and then scraping back off the excess. I also freeze any untouched ganache for my next cake.


Use these steps to make a gorgeous Pink Tiffany Wedding Cake

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