Peel, wash and finely grate the carrots. Finely grind the walnuts. Separate eggs. Beat egg whites, salt and 2 tablespoons of water until very stiff, add 100 g sugar. Stir in egg yolk. Mix almonds, walnuts, flour, baking powder and carrots and fold into the egg mixture. Line the bottom of a springform pan (26 cm Ø) with baking paper.
Fill in sponge mixture and smooth it down. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 40-45 minutes. Then let it cool down a little and remove from the mould. For the cream, mix mascarpone, quark, 50 g sugar, vanillin sugar and orange juice. Spread loosely on the cold base. Decorate as you like with self-formed marzipan carrots, small flowers made of almond kernels and pistachios