4 tbsp. butter
2 (1 oz.) sq. semi sweet chocolate
1 c. sugar
1 sm. can evaporated milk
1 tsp. vanilla

In small saucepan over low heat, melt the butter and chocolate. Add sugar. Slowly add milk, stirring constantly. Bring just to a full boil; then turn off heat; add vanilla. Sauce will thicken as it cools. Store in refrigerator. May be reheated over low heat or in microwave.