Texas Pecan Icebox Gems

1/2 cup butter
1 cup granulated sugar *
1 egg, slightly beaten
2 cups all-purpose flour
1/2 teaspoon cream of tartar
1/2 teaspoon baking soda
1 teaspoon vanilla extract
1/2 cup Texas pecans

Cream butter and sugar together; add egg, vanilla extract, sifted dry ingredients and pecans. Mix well. Shape into a long, slender roll and wrap in wax paper. Place in refrigerator overnight.

Slice very thin and bake at 400 degrees F for 10 minutes.

* Brown sugar may be used if butterscotch flavor is desired.