c("Cream sugar and butter.", "Add egg yolks and 1 teaspoon  Grand Marnier.", "Continue to beat. Sift flour, baking soda and  baking powder.", "Add flour to mixture with sour cream, beginning  and ending with dry ingredients.", "Add orange rind, walnuts and  stiff beaten egg whites.", "Butter and flour an angle food cake  pan.", "Bake at 350 degrees for 55 minutes.", "Spoon topping over baked  cake while still in hot pan.", "Cool and invert onto serving  plate.")