1 can dulce de leche (about 400g)
11 tbsp. butter
5 oz. semi-sweet chocolate

Cook 1/2 of dulce de leche and the chocolate in a double boiler.  Once it melts 
add butter and the rest of the dulce the leche. Cook until well blended.

This is really good, but a little slippery. It goes very well with a 
white or pound cake.