Chocolate Frosting
["3 sticks margarine", "3/4 c. cocoa", "1 1/4 c. milk", "1/4 tsp. salt", "2 1/2 Tbsp. vanilla", "3 1/2 lb. powdered sugar"]
["Melt margarine and add cocoa; simmer.", "Add milk, salt and vanilla.", "Simmer for 7 to 8 minutes.", "Add this mixture to powdered sugar.", "Beat until cool.", "Spread on cake."]
["margarine", "cocoa", "milk", "salt", "vanilla", "powdered sugar"]