Roughly chop the nuts. Cut figs into large pieces. Beat the fat, 125 g sugar, salt and 1 packet of vanillin sugar with the whisk of the hand mixer until foamy. Stir in 3 eggs one after the other. Mix flour and baking powder and stir in. Fold in nuts and figs.
Fill the dough into a springform pan (26 cm Ø) lined with baking paper, smooth it down and bake in the preheated oven (electric range: 175 °C/ gas: level 2) for 30-40 minutes. Remove from the oven, place on a grid, remove from the edge with a sharp knife and let cool in the baking tin. Remove the base from the mould, place on a cake plate and enclose with a cake ring. Whip the cream until stiff. Roughly chop the chocolate and melt in a hot water bath (must not boil!). Whip the remaining eggs, sugar, vanilla sugar and spices in a warm water bath with the whisk of the hand mixer until thick and creamy white. Stir in melted chocolate drop by drop. Stir in 1/3 of the cream, fold in the rest of the cream in portions. Place the chocolate mousse on the cake base, smooth it down and refrigerate for approx. 5 hours. Crumble the speculoos. Remove the cake from the cake ring with a sharp knife.
Whip the remaining eggs, sugar, vanilla sugar and spices in a warm water bath with the whisk of the hand mixer until thick and creamy white. Stir in melted chocolate drop by drop. Stir in 1/3 of the cream, fold in the rest of the cream in portions. Place the chocolate mousse on the cake base, smooth it down and refrigerate for approx. 5 hours. Crumble the speculoos. Remove the cake from the cake ring with a sharp knife. Sprinkle with speculoos and decorate as you like with fig slices dipped in chocolate and walnut halves. Results in about 16 pieces