Dissolve the piece of butter on the stove, then add the chocolate and stir.
Then add the two cans of sweetened condensed milk and stir well, finally fold in the 4 tablespoons of cocoa.
Let it cool down a bit and then fill it into glasses.
Note: The list of ingredients was supplemented by the head chef, as there were always questions in the comments. It is now clear that it is sweetened condensed milk, nougat chocolate and unsweetened cocoa.