Clean, peel and finely grate the carrots. Coarsely chop chocolate and walnuts. Cream fat, sugar, salt, vanillin sugar and lemon peel. Add the eggs one after the other and stir in.
Mix flour, breadcrumbs and baking powder and stir in together with carrots, chocolate and walnuts. Put the dough on a greased baking tray sprinkled with breadcrumbs and smooth it down. Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 40-45 minutes and let cool off.
Mix icing sugar and lemon juice. Quarter lemon slices, halve pistachios. Spread the cake with icing and decorate with candied lemon pieces, pistachios and mint leaves as desired.
Allow to dry.