Lucy Kammerdiener'S Mayonnaise Cake
["2 c. sifted flour", "2 tsp. baking soda", "1 c. sugar", "1/2 c. cocoa", "1/4 tsp. salt", "1 c. mayonnaise", "1 c. cold water", "1 tsp. vanilla"]
["Combine and sift flour, baking soda, sugar, cocoa and salt. Add mayonnaise, cold water and vanilla.", "Blend well.", "Pour batter into two greased 8-inch round cake pans.", "Bake 30 minutes at 350\u00b0 or a 9 x 13-inch pan for 35 minutes."]
["flour", "baking soda", "sugar", "cocoa", "salt", "mayonnaise", "cold water", "vanilla"]