Old-Fashioned Chocolate Icing
["2 1/2 c. sugar", "1/2 c. cocoa", "5 tsp. flour", "2 large cans Pet milk", "1/8 tsp. salt", "1/2 stick butter", "1 tsp. vanilla"]
["Sift together dry ingredients.", "Add milk gradually; cook over medium heat in a thick-bottomed pot, stirring constantly until mixture thickens.", "Add butter and vanilla.", "Cool and spread on cake."]
["sugar", "cocoa", "flour", "Pet milk", "salt", "butter", "vanilla"]