Buttermilk Biscuits

1 cup buttermilk (or 1 c. milk + 2 T. lemon juice)

2 1/2 cups flour

4 teaspoons baking powder

1/4 teaspoon baking soda

3/4 teaspoon salt

2 tablespoons softened butter

2 tablespoons shortening

Bake at 400* for 15-20 minutes