Melt 150 g chocolate chips over a warm water bath. Add 150 g peanuts. Put 40 small heaps on a piece of baking paper. Leave to dry. Melt 250 g couverture chips and butter over a warm water bath, let it cool down a little.
Coarsely chop 200 g peanuts. Whip eggs, sugar and vanillin sugar until thick and creamy white. Stir in peanut butter and melted chocolate coating and butter. Stir in 250 g crème fraîche. Mix flour, cocoa and salt and stir in briefly.
Grease the fat pan of the oven (32 x 39 cm). Pour the mixture on top and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 30 minutes. (Cake should still be slightly moist and sticky in the middle).
In the meantime, mix icing sugar and lemon juice until smooth. Take the cake out of the oven and spread the icing evenly on top. Place on a grid and allow to cool or dry. Cut the cake into pieces and spread 250 g crème fraîche as a blob.
Decorate with peanut heaps.