Finely grate the carrots, coarsely chop the chocolate and walnuts. Mix the butter, sugar, salt, lemon zest and vanilla sugar until creamy. Then gradually stir in the eggs. Mix the flour, breadcrumbs and baking powder and stir in briefly. Then carefully fold in the grated carrots, chopped chocolate and walnuts. Spread the dough on a greased baking sheet sprinkled with breadcrumbs and bake in a preheated oven at 175 ° C for about 40 minutes. Let cool down.
Mix the icing sugar and lemon juice into a glaze and pour it over the cake in diagonal stripes.
It is best to let it steep 1-2 days before consumption.