Jam Cake
["1 c. butter", "2 c. sugar", "6 egg yolks", "4 c. sifted plain flour", "1 tsp. cinnamon", "1 tsp. nutmeg", "2 tsp. soda", "1/2 c. sour cream", "6 egg whites", "2 c. blackberry jam"]
["Cream butter and sugar until light and fluffy.", "Beat in egg yolks, one at a time, mixing well.", "Stir in jam, add flour which has been sifted with spices, alternately with sour cream and ending with flour.", "Fold in stiffly beaten egg whites.", "Bake in four 9-inch layers in 350\u00b0 oven until center springs back when pressed with finger.", "(May also be baked in a tube pan.)", "Frost with Never Fail Frosting."]
["butter", "sugar", "egg yolks", "flour", "cinnamon", "nutmeg", "soda", "sour cream", "egg whites", "blackberry jam"]