Cream
butter and 1 cup sugar until light and fluffy. Beat in egg yolks. Add
sifted dry ingredients alternately with sour cream, beating until
smooth. Stir in rind and chopped nuts. Fold in stiffly beaten egg
whites. Pour into buttered 9 inch tube pan and bake in moderate (350
degree) oven for 50 minutes
Mix 1/2 cup sugar, orange juice and grand marnier and
spoon over hot cake in pan. Decorate top with almonds. Cool before
removing from pan