1 (13 oz.) can Pet milk
1 lb. Kraft caramels
1/2 lb. butter
12 oz. Nestle milk chocolate bars (no substitutes for these)

Put all ingredients in top of double boiler over simmering water. Stir until smooth. Continue to cook 30 minutes. Stir to keep it from scorching. Put hot sauce through blender or beat at high speed with electric mixer. Pour into refrigerator container with lid. Refrigerate sauce between uses. Keeps up to 2 weeks in refrigerator. This freezes well. To serve over ice cream, reheat over hot water. Makes about 1 quart.