Chop 75 g cashew nuts. Mix flour, sugar, baking soda, vanillin sugar, fat, soured milk, bananas and eggs with the whisks of the hand mixer at highest speed for about 3 minutes. Stir in chopped cashew nuts. Grease a box form (25 cm long, 1 1/2 litre capacity) and dust with flour. Pour in the dough.
Bake the cake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-40 minutes. Remove from the oven and allow to cool in the mould for about 10 minutes. Turn out onto a cake rack and let it cool down. Roast 1 tablespoon of cashew nuts in a pan without fat, take them out and let them cool down. Chop the chocolate coating and melt it on a hot water bath. Put 1 tablespoon of couverture in a freezer bag. Cover the cake with the remaining chocolate coating and let it get slightly taut. Peel the baby bananas and place them in the still moist couverture. Spread the cashew nuts on the cake.
Chop the chocolate coating and melt it on a hot water bath. Put 1 tablespoon of couverture in a freezer bag. Cover the cake with the remaining chocolate coating and let it get slightly taut. Peel the baby bananas and place them in the still moist couverture. Spread the cashew nuts on the cake. Cut off a small corner of the freezer bag and decorate the bananas with the chocolate coating
Waiting time approx. 1 hour