1/4 cup butter
2/3 cup sugar
5 oz. (~2/3 cup) evaporated milk
In
a heavy small saucepan melt the chocolate chips and butter. Add sugar;
gradually stir in evaporated milk. Bring mixture to boil; reduce heat. Boil
gently over low heat for 8 minutes, stirring frequently. Remove pan from heat.
Cool slightly. Makes about 1 1/2 cups sauce. (I usually double it and
refrigerate—when you reheat in microwave, take out the portion you want and
only heat that. If you don't it will turn grainy.)