Sour Cream Plain Cake
["1/2 lb. margarine", "3 c. sugar", "6 egg yolks", "3 c. flour", "1 1/2 tsp. vanilla", "1/4 tsp. soda", "1/2 tsp. salt", "1/2 pt. sour cream"]
["Cream together margarine and sugar.", "Add slowly the egg yolks, flour, vanilla, soda, salt and sour cream.", "Mix all ingredients together.", "Then fold in 6 stiffly beaten egg whites.", "Cook at 300\u00b0 for 1 1/2 hours in a Bundt pan."]
["margarine", "sugar", "egg yolks", "flour", "vanilla", "soda", "salt", "sour cream"]