2 c. sifted flour
1 tsp. baking powder
1 tsp. baking soda
1 c. butter, softened
1 1/2 c. sugar
3 eggs, separated
1 c. sour cream
1 tbsp. grated orange rind
1/2 c. chopped walnuts or pecans
1/4 c. orange juice
1/3 c. Grand Marnier or other orange flavored liqueur
2 tbsp. chopped walnuts or pecans

Sift flour, baking powder, baking soda onto wax paper. Beat butter, 1 cup sugar, and egg yolks in a large bowl until light and fluffy. Add flour mixture alternately with sour cream, starting and ending with flour. Stir in orange rind and the 1/2 cup chopped nuts. Beat egg whites in a small bowl with electric mixer until stiff but not dry. Fold into batter. Spoon batter into a greased 9 inch tube pan. Bake at 350 degrees for 50 minutes, or until a toothpick inserted in the top comes out clean.

Combine juice and the remaining 1/2 cup sugar in a small saucepan. Heat, stirring constantly, over low heat just until sugar is dissolved. Remove from heat and stir in Grand Marnier. Spoon mixture over hot cake. Sprinkle with nuts. Cool in pan on wire rack 15 minutes. Loosen around edge and tube with knife. Turn out onto wire rack.