Buttermilk Biscuits

1 c. Flour
2 tsp. Baking Powder
1/4 tsp. Cream of Tartar
1/2 tsp. Salt
1/4 c. Butter
1/3 c. Milk
1 tsp. Vinegar
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Mix vinegar with milk to sour while you sift dry ingredients together.  Cut in butter.  Add milk and stir just until moist.  Roll out on a floured surface to about 3/4 inch thick.  Cut biscuits and place on an ungreased cookie sheet.  Bake at 450 for 10-12 minutes.