Line the bottom of a springform pan (26 cm Ø) with baking paper. Drain the cherries. Stir 100 g fat and 80 g sweetness until creamy. Stir in eggs. Alternately stir in flour and baking powder with 2 tablespoons of milk.
Spread 1/2 dough into the form. Mix the remaining dough with cocoa and 2 tablespoons of milk. Spread on the light-coloured dough. Add the cherries, except some for decoration. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 40 minutes.
Stir pudding powder, 20 g diabetic sweetener and 8 tablespoons of milk until smooth. Boil up the rest of the milk. Stir in pudding powder, bring to the boil. Let it cool down. Whip 200 g butter until creamy. Stir in the pudding by the spoonful.
Spread 3-4 cream on the cake. Melt the chocolate in a hot water bath. Spray on the cake in a wave shape. Spray the rest of the cream in tuffs onto the cake. Decorate with cherries.