Texas Sheet Cake
["2 sticks margarine/butter", "4 Tbsp. cocoa", "1 c. water", "2 c. flour", "2 c. sugar", "1/2 tsp. salt", "2 eggs", "1/2 c. sour cream or sour milk", "1 tsp. baking soda", "1 tsp. vanilla"]
["Combine margarine, cocoa and water; bring to a boil.", "Add to flour, sugar and salt.", "Add eggs, sour cream, vanilla and baking soda.", "Beat."]
["margarine", "cocoa", "water", "flour", "sugar", "salt", "eggs", "sour cream", "baking soda", "vanilla"]