Separate the eggs for the sponge cake. Beat the egg white and 2 tbsp. water until stiff, adding 50 g sugar and salt. Stir in 2 egg yolks. Mix flour and baking powder, sieve over the mixture and fold in.
Put the sponge cake into a springform pan (26 cm Ø) lined with baking paper and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 12-15 minutes. Remove from the oven and let it cool down on a cake rack.
Boil 150 g raspberries with 50 g sugar in a pot. Stir the starch with a little water until smooth, add to the boiling raspberries. Let simmer for about 1 minute while stirring. Fold in the rest of the frozen raspberries, remove from the heat and allow to cool.
Chop both types of couverture separately and carefully melt each with 1/2 cube of coconut oil over a warm water bath. Halve about 9 lady fingers and cover with white chocolate coating. Coat 2 whole lady fingers with dark chocolate coating, allow to dry.
Decorate dark couverture with some white couverture, let it dry.
Remove the bottom from the mould. Place on a cake plate and place a cake ring around it. For the cream, soak gelatine in cold water. Whip 2 egg yolks with icing sugar until white-creamy. Stir in mascarpone and lemon zest.
Squeeze the gelatine well, dissolve carefully with rum. Stir a little cream into the gelatine, then stir everything into the rest of the cream. Whip 250 g cream until stiff and fold in. Spread a little cream on the base.
Place the lady fingers in the cream with some distance to the edge. Leave about 3 light sponge fingers between the sponge fingers with dark chocolate coating. Chill the cake for approx. 10 minutes, storing the cream at room temperature.
Spread the raspberry jelly over the cake, leaving some space between the sponge fingers. Carefully add the rest of the cream and spread it. Chill for at least 3 hours. Whip 150 g cream until stiff.
Remove the cake from the tin and spread the bottom edge with cream. If necessary, dust a rabbit face with a template and cocoa.