Mrs. Capp'S Heavenly Hot Fudge Sauce(1961)  
["1/2 c. butter", "4 oz. unsweetened chocolate", "3 c. sugar", "14 1/2 oz. evaporated milk", "1/2 tsp. salt"]
["Melt butter in top of double boiler.", "Add chocolate and blend. Add sugar, milk and salt and cook on low heat, stirring frequently, for 20 minutes."]
["butter", "unsweetened chocolate", "sugar", "milk", "salt"]