Melt 250 g butter. Mix flour, 150 g sugar and 1 pinch of salt. Add the butter and knead into crumbles. Halve the crumble mixture. Knead 2 tablespoons of cocoa under one half of the nuts and 2 tablespoons of cocoa under the other half.
Grease the springform pan (26 cm Ø). Put cocoa crumbles into the mould and press them down to the flat bottom. Chill for about 30 minutes.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Bake in the hot oven for approx. 12 minutes. Remove and let cool on a cake rack.
Chop the chocolate and melt in a hot water bath. Stir in nut nougat cream and 100 g sugar. Stir cream cheese until smooth. First stir in the chocolate mix, then the eggs one by one. Smooth the cheese mixture on the base. Spread the nut crumbles on the cheese mixture. Bake in the oven at the same temperature for 45-50 minutes.
Take out and let it cool down on a cake rack. Remove the cake from the mould and dust with cocoa.