Chocolate Mocha Cake
["1 egg, beaten", "1 c. sugar", "1 c. sour milk", "1/2 c. butter", "1 tsp. soda", "1 1/2 c. flour", "2 Tbsp. cocoa", "1 tsp. vanilla"]
["Cream butter.", "Add sugar and beaten egg.", "Dissolve soda and cocoa in sour milk and add to mixture.", "Work in the flour slowly. Beat 100 times.", "Place the mixture in a well-greased, 9 x 13-inch pan and bake at 350\u00b0 for 35 to 40 minutes."]
["egg", "sugar", "sour milk", "butter", "soda", "flour", "cocoa", "vanilla"]