Separate eggs. Beat the egg whites and 3 tbsp. cold water until stiff, add 50 g sugar. Beat the egg yolks and 50 g sugar with the whisk of the hand mixer until stiff. Mix starch, flour, cocoa powder and baking powder. Sift the flour mixture over the egg yolk mixture and fold in. Stir in 1/3 of the egg whites. Carefully fold in the remaining beaten egg white
Spread the mixture on a baking tray lined with baking paper. Bake the sponge cake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 8 minutes. Remove and turn out onto a tea towel sprinkled with sugar. Remove the baking paper. Roll up the sponge cake with the tea towel and let it cool down
Soak gelatine in cold water. Halve the mango, cut the flesh off the stone, peel and dice. Dissolve gelatine over a hot water bath. Stir 4 tablespoons of buttermilk into the gelatine, then stir into the rest of the buttermilk. Chill buttermilk for about 20 minutes until the mixture begins to gel. Stir in yoghurt, grated coconut and mango. Whip the cream until stiff, pour in 100 g sugar and fold in
Unroll the sponge cake and spread with the cream, leaving about 1 cm free on the upper long side. Roll up the sponge cake from the lower long side and chill for approx. 2 hours. Decorate roulade with coconut chips, cut open and arrange on a plate
Picture 02: without coconut chips
Waiting time approx. 20 minutes