Brown Derby Sour Cream Raisin Biscuits

4 cups all purpose flour
1 tsp cream of tarter
1 tsp baking powder
1/2 tsp baking soda
1/4 cup vegetable shortening
1 cup raisins
1 cup sour cream
1 cup whole milk

Preheat oven to 450 degrees F.
In a large bowl, whisk flour, cream of tarter, baking powder, soda and salt.
Using a pastry blender incorporate shortening until well blended.
Add raisins, sour cream and milk.
Add addtional flour or milk until the mixture forms a soft dough.
Pat on a floured surface, roll out evenly, cut with a 2-inch biscuit cutter.
Place on prepared baking sheet close together and bake until golden brown, about 12 to 15 minutes.
Serve hot with butter.