1/2 c. butter
4 squares unsweetened chocolate
3 c. sugar
1/4 tsp. salt
1 2/3 c. evaporated milk
1 tsp. vanilla

Melt butter and chocolate in top of double broiler, add sugar gradually, about 1/4 cup at a time. Blend thoroughly before each additional ingredient. Add salt. Slowly stir in evaporated milk. Continue to cook about 7 or 8 minutes to dissolve the sugar. Remove from heat and add vanilla.