Finely grind the Amarettini in the universal chopper. Put 2 tablespoons aside for sprinkling. Put the baking mixture into a mixing bowl. Add butter, eggs and Amarettini. Knead to a smooth dough with the dough hooks of the hand mixer.
Fill several portions into a piping bag with perforated nozzle (8 mm Ø). Spray strips (approx. 5 cm long) onto three baking trays lined with baking paper. Sprinkle thinly with Amarettini that have been put aside.
Bake one after the other in a preheated oven (electric oven: 175 °C/ convection oven: 150 °C/ gas: stage 2) for 11-12 minutes. Mix icing sugar and cocoa. Remove the biscuits from the oven, place them on a grid, let them cool down and dust them thinly with icing sugar and cocoa mixture.