(Cake: from I love Cake by Trish Deseine / buttercream: from What Katie Ate by Katie Quinn Davis)
225g soft butter
4 tablespoons cocoa powder (dissolved in about 4 tablespoons hot water)
2 teaspoons baking powder
for two 20cm diameter springform pans
Preheat the oven to 180°C and line your springform pans with parchment paper.
Mix all ingredients in a large bowl with an electric hand mixer until smooth. (The recipe says exactly this. I added the ingredients in stages nevertheless, beating inbetween. First the butter and the sugar, then the eggs, then the flour and baking powder, then the cocoa powder.
Fill your dough into the prepared springform pans and bake for about 25 minutes. Test with a wooden skewer whether they are done. No cake batter should stick to the wooden skewer.
Take out of the oven and let cool. You can easily prepare this one day ahead.
When the cakes have completely cooled. Trim off just a little bit of the rounded tops with a sharp knife so that they have flat surfaces for the buttercream.
Prepare your buttercream:
300g butter, softened
155g icing sugar (I used more to make the buttercream a bit thicker)
170g dark chocolate
1 teaspoon vanilla extract
1 tablespoon strong coffee (or instant coffee)
In a bowl, beat butter and icing sugar until smooth and creamy.
Meanwhile, bring a small saucepan of water to a gentle simmer and melt the chocolate in a small heatproof bowl that fits snugly over the pan without touching the water, stirring occasionally.
Remove from the heat and add the vanilla and coffee to the melted chocolate and combine; it will start to become lumpy, but don't worry. Add this to the butter and sugar mixture, beating gently until glossy and smooth.
Use a spatula to spread the butter cream on top of the first cake and spread it out towards the edges. Place the second cake on top, then ice the top and the sides of the cake.
Then, decorate just the way you like. I used rose petals which I dipped into a small bowl of two lightly beaten egg whites and then covered with sugar. You should do this the day before and let dry over night.