Grandma McGee's Mile High Biscuits

3 cups flour
1/4 cup sugar
4 tsp. baking powder
1/2 tsp. cream of tartar
3/4 tsp. salt
1/2 cup shortening
1 egg, beaten
1 1/8 cup milk

Combine dry ingredients in a mixing bowl. Cut in shortening until mixture resembles coarse crumbs. Add egg and milk all at once; mix until dough forms a ball. Turn dough out on a lightly floured surface and knead 10 to 12 times. Roll out to 3/4 inch thickness; cut with floured 2 1/2 inch biscuit cutter. Place on an ungreased baking sheet and freeze. When biscuits have frozen, they may be stored in a plastic bag in the freezer until needed.
To bake frozen biscuits, place on a lightly greased pan. Bake at 475 degrees for 12 to 15 minutes, until light brown. Yields 1 dozen.

That's how Grandma's recipe is written, but I have never frozen the biscuits. I always cook them up right away, and I never grease the pan.