Grandma'S Chocolate Icing
["1 1/2 or 2 c. sugar", "3 Tbsp. cocoa", "2 Tbsp. flour", "1 c. milk or cream", "1 or 2 tsp. vanilla", "1/2 or 1 stick butter"]
["Bring to a boil on medium heat; boil, stirring all the time to prevent sticking and scorching.", "Cook until it thickens and pour over cake."]
["sugar", "cocoa", "flour", "milk", "vanilla", "butter"]