Chocolate Sheet Cake
["2 c. sugar", "2 c. plain flour", "2 sticks butter", "3 to 4 Tbsp. cocoa", "1 c. water", "1/2 c. buttermilk", "2 eggs, beaten", "1 tsp. soda", "1 tsp. vanilla"]
["In large bowl, sift sugar and flour.", "In a saucepan, bring to boil margarine, cocoa and water.", "Pour margarine mixture into flour and sugar.", "Add remaining ingredients into bowl.", "Pour into greased 9 x 13-inch sheet pan."]
["sugar", "flour", "butter", "cocoa", "water", "buttermilk", "eggs", "soda", "vanilla"]