Chocolate Mayonnaise Cake
["2 c. all-purpose flour", "1/4 c. plus 1 tsp. cocoa", "1 c. sugar", "1 tsp. baking soda", "pinch of salt", "1 c. water", "1 c. mayonnaise", "1 1/2 tsp. vanilla"]
["Combine first 5 ingredients; mix well.", "Add next 3 ingredients; stir until smooth.", "Pour batter into a greased and floured 9-inch square pan.", "Bake at 350\u00b0 for 25 to 30 minutes or until a wooden pick inserted in center comes out clean.", "Cool completely; spread with Chocolate Frosting."]
["flour", "cocoa", "sugar", "baking soda", "salt", "water", "mayonnaise", "vanilla"]