1936 Caramel Frosting
["2 c. brown sugar, packed", "1 c. granulated sugar (white)", "2 Tbsp. white Karo syrup", "3/4 c. milk", "1/4 c. butter Crisco", "1/4 c. butter", "1/4 tsp. salt", "1 tsp. vanilla"]
["Mix all ingredients in a large saucepan.", "Bring slowly to a full boil, stirring constantly.", "Boil hard for 2 minutes (2 1/2 minutes on a rainy day).", "Cool to lukewarm.", "Add vanilla and beat until creamy."]
["brown sugar", "sugar", "white Karo syrup", "milk", "butter", "butter", "salt", "vanilla"]