Texas Sheet Cake
["2 sticks margarine", "1 c. water", "4 Tbsp. cocoa", "2 c. sugar", "2 eggs", "1/2 c. sour milk", "2 c. flour", "1 tsp. baking soda", "1/2 tsp. salt"]
["Bring to boil in saucepan the margarine, water and cocoa. Cool. Add the sugar and eggs. Alternately add and mix the sour milk, flour, baking soda and salt. Bake at 350\u00b0 for 20 minutes."]
["margarine", "water", "cocoa", "sugar", "eggs", "sour milk", "flour", "baking soda", "salt"]