Well, it is not like the real chocolate at all. It tastes very rich and heavy. Of course you can use any kind of nuts that you like, and you can roast them. I used half peanut - half hazelnut. This is a sweet from my childhood.
1000 g suger
200 ml water
50 ml rum
4 tablespoon cocoa powder (unsweetend)
500 g milk powder
400 g nuts
250 g butter
Mix sugar with cocoa, add water, rum and cook it until it starts to boil and sugar is melted. Stir in butter, milk powder, nuts (these you can roast). Mix all well and pour into a form where you put some foil before. After it is cool down cut in pieces and keep in silver foil.