Gingered Lemon Cookies

1/2 cup butter
1/2 cup dark brown sugar
1 egg
1 Tbsp. grated lemon rind
1 Tbsp. lemon juice
1 tsp. powdered ginger
1/4 tsp. salt
2 cups flour

Cream butter and brown sugar. Stir in egg, lemon rind and juice. Sift together dry ingredients and stir into butter and sugar. Knead and roll into 2 inch balls and press onto cookie sheet. Bake at 350 degrees.