Finely grind the pistachios. Knead with the marzipan, divide into five parts and form into rolls of 30 cm each. Sieve the icing sugar into a mixing bowl, add the fat and whisk with the whisk of the hand mixer until foamy. Stir in egg yolk. Sift flour and cocoa over it.
Add salt and nuts and knead to a smooth dough with the dough hooks of the hand mixer. Roll out the chocolate-nut dough between 2 layers of cling film to a rectangle (approx. 40 x 30 cm). Cut into strips (8 x 30 cm). Place one marzipan roll each on a strip of dough and roll up. Chill for at least 30 minutes. Form the rolls into triangular sticks, e.g. with two rulers. Cut them into pieces about 1 1/2 cm wide and place them on three baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 175 °C/ gas: level 2) for 10-12 minutes.
Form the rolls into triangular sticks, e.g. with two rulers. Cut them into pieces about 1 1/2 cm wide and place them on three baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 175 °C/ gas: level 2) for 10-12 minutes. Let cool on a cake rack. Results in approx. 100 pieces