Source: Swan's Down Cake Flour

1 cup (2 sticks) margarine, softened
1/2 cup (1 stick) butter, softened
8 ounces cream cheese, softened
6 eggs, divided
3 cups cake flour, sifted, divided
3 cups granulated sugar, divided
1/8 teaspoon vanilla extract
1/8 teaspoon lemon extract

Cream together margarine, butter and cream cheese in a large bowl. Add 2 eggs, 1 cup flour and 1 cup sugar; mix well. Repeat until all eggs, flour and sugar have been added. Add extracts and mix well. The batter will be very thick. Place batter in a greased and floured Bundt pan. Bake at 300 degrees F for 1 hour and 15 minutes, or until a wooden pick inserted in the center comes out clean.