Mayonnaise Cake
["2 c. flour", "4 Tbsp. cocoa", "1 c. sugar", "pinch of salt", "1 c. lukewarm water", "2 tsp. baking soda, dissolved in the warm water", "1 c. mayonnaise"]
["Mix all together.", "Bake at 350\u00b0 for 20 to 35 minutes.", "Test with toothpick."]
["flour", "cocoa", "sugar", "salt", "water", "baking soda", "mayonnaise"]