Grease a ring cake tin (22 cm Ø; approx. 2.5 litres capacity) and sprinkle with breadcrumbs. Grind the nuts. Chop chocolate. Mix icing sugar, starch, flour and baking powder, sieve into a bowl. Mix in the nuts. Dissolve cappuccino in 100 ml hot water.
Stir oil, cappuccino and liqueur into the flour mixture. Stir in the eggs one by one. Fold in chocolate. Spread into the mould. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 60-70 minutes. Take out and let rest for about 10 minutes. Then turn out and let cool down. Chop the chocolate coating and melt in a hot water bath. Spread half thinly on a marble plate or large plate, allow to set. Melt the rest of the couverture again and spread it on the cake. Use a spatula to remove the solidified couverture and spread it immediately on the cake.
Take out and let rest for about 10 minutes. Then turn out and let cool down. Chop the chocolate coating and melt in a hot water bath. Spread half thinly on a marble plate or large plate, allow to set. Melt the rest of the couverture again and spread it on the cake. Use a spatula to remove the solidified couverture and spread it immediately on the cake. Leave to dry. Dust with icing sugar and cocoa