Chocolate Sheet Cake
["2 c. flour", "2 c. sugar", "1 tsp. soda", "1 tsp. salt", "4 Tbsp. cocoa", "1 c. water", "2 eggs", "1/2 c. buttermilk", "1/2 tsp. vanilla"]
["Melt cocoa in water and bring to a boil.", "Pour over dry ingredients.", "Beat eggs, add buttermilk and vanilla.", "Add to mixture and beat.", "Pour on large cookie sheet.", "Bake at 350\u00b0 for 15 to 20 minutes."]
["flour", "sugar", "soda", "salt", "cocoa", "water", "eggs", "buttermilk", "vanilla"]