Sour Cream Cake
["3 c. flour", "1/4 tsp. soda", "1/2 tsp. salt", "1 c. butter", "3 c. sugar", "6 eggs, separated", "1 c. sour cream"]
["Sift flour, soda and salt. Cream butter and sugar; add egg yolks, one at a time, beating well after each addition. Add sour cream alternately with flour mixture. Fold in stiffly beaten egg whites. Bake in tube pan at 300\u00b0 to 325\u00b0 for 1 1/2 hours. Turn out of pan immediately. Serve plain or with frosting."]
["flour", "soda", "salt", "butter", "sugar", "eggs", "sour cream"]