In a bowl of a blender, place sugar, egg yolks, melted butter (melt the butter over very low heat; it must not get too hot), dark chocolate powder, and the splash of alcohol;
Coarsely crush the biscuits: I put them into a bag and bash them with my hands or with a rolling pin. You want a bag of small chunks, not powder because you want to see them when you cut the salami and feel them in your mouth when you bite into one. Do not use a food processor;
Blend all the ingredients until the smooth and add chopped biscuits and chocolate chips (or dried fruit to your taste).
Place the dough onto a piece of plastic wrap and shape it into a cylinder. Try to make it as cylindrical as you can; use your hands and a spatula. Roll it up into the plastic wrap tightly into a long big tube of dough. Then, wrap it in aluminum foil.
Place the cylinder in the fridge or in the freezer for at least 6 or 7 hours.
After chilling, remove both the plastic wrap and the aluminum foil and roll it in powdered sugar. Cut the chocolate salami into ½ inch (1 cm) thick slices like an actual piece of salami.