1 cup butter
1/2 cup shortening
2 cups white sugar
4 eggs
3 cups all-purpose flour
1 teaspoon vanilla extract
1 teaspoon lemon extract (optional - can substitute almond extract)
7 fluid ounces lemon-lime flavored carbonated beverage

Preheat oven to 325 degrees F (165 degrees C). Grease and flour a 10 inch Bundt pan.

In a large bowl, cream together the butter, shortening and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla and lemon extracts. Beat in the flour alternately with the lemon-lime soda, mixing just until incorporated.

Pour batter into prepared pan. Bake in the preheated oven for 70 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool on a cake rack for 30 minutes before removing from the pan.