Lemon Walnut Rum Ring
["1 c. butter", "1 c. sugar", "2 c. flour", "1 tsp. baking powder", "1 tsp. baking soda", "1 c. sour cream", "2 tsp. grated lemon peel", "1/2 c. chopped walnuts", "3 egg yolks", "3 egg whites", "1/4 c. lemon juice", "1/4 c. light rum", "1/3 c. sugar"]
["Cream butter and sugar.", "Add beaten egg yolks.", "Sift together flour, baking powder and baking soda and add alternately with sour cream, lemon peel and walnuts."]
["butter", "sugar", "flour", "baking powder", "baking soda", "sour cream", "walnuts", "egg yolks", "egg whites", "lemon juice", "light rum", "sugar"]