Cakes : Break/chop chocolate into small pieces and place in a microwave-safe bowl. Heat in the microwave at 50% power for 1 to 1 1/2 minutes, until melted and smooth; stir after every 30 seconds and ensure that this doesn't overheat. Once done, cool for 10 minutes.
Combine flour, baking powder and salt. Set aside.
With an electric mixer, beat butter at medium speed for 30 seconds. Slowly add Chelsea White Sugar and beat until well combined. Reduce to low speed and add eggs one at a time, beating well after each addition. Add vanilla and mix in well.
With the mixer on low speed, alternately add flour mixture and milk, mixing until just combined.
Gently stir in white chocolate.
Pour batter into prepared cake tins, dividing evenly. Bake at 170
°C for 20 minutes. Use a toothpick to see if it comes out clean. If so, the cakes are cooked.
Choc Buttercream : Melt the chocolate in a bowl, over a pot of boiling water. Once melted, let it cool to room temperature. Place softened butter in a bowl and sift Chelsea Icing Sugar over top. Starting slow, mix until well incorporated and then beat until fluffy (approx. 1 - 2 minutes).
After the bowl has been scraped, add cream and vanilla. You can stir in the melted (& cooled) chocolate.
Turn your mixer to medium-high and beat for 3 to 4 minutes.
Ganache : Warm the cream, then break chocolate roughly and stir it in the cream. Stir well.
Chocolate Brushstrokes : Coarsely chop up both dark and white chocolates. Place 2/3 of the chocolate in 2 double boilers over gently simmering water. Ensure the water does not ouch the bottom of the double boilers or your chocolate may overheat and lose its shine and smoothness.
Melt the chocolate until the temperature reaches 45°C on a cooking thermometer. Remove the chocolate from the heat and stir in the remaining 1/3 of chocolate; stir with a spatula from time to time. Keep stirring the melted chocolate until it cools down to 27°C, and return to heat, stirring gently until the chocolate reaches 32°C.
Once the chocolate is smooth and shiny, it is ready to be used.
Brush the tempered dark chocolate onto baking paper and then set aside to cool.
Use some tempered white chocolate for white brushstrokes, then add pink powder food colour to white chocolate to make some pink brushstrokes. Use the rest of the chocolate for moulding chocolate flower. Leave to cool.
How to assemble: : Layer cakes together with buttercream, and also coat outside. Smooth edges.
Drip pink ganache over top then decorate with chocolate brushstrokes and flower.