Chocolate Cake(From 1925 Watkins Cookbook)  
["1/2 c. cocoa", "1/2 c. white sugar", "1/2 c. milk", "1 egg yolk", "1 c. sugar", "1/2 c. butter", "2 eggs", "1/2 c. sour milk, into which 1 tsp. soda has been dissolved"]
["Boil the first four ingredients and cool.", "Mix together with remaining ingredients and add 2 cups flour.", "Bake in moderate oven in layers.", "Ice with chocolate icing and nuts."]
["cocoa", "white sugar", "milk", "egg yolk", "sugar", "butter", "eggs", "sour milk"]