Angel Sugar Cookies

1 cup shortening
1 cup granulated sugar
1/2 cup brown sugar
1 egg
1 teaspoon vanilla
2 cups flour, sifted
1 teaspoon baking soda
1 teaspoon cream of tartar
1 teaspoon salt

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Sift dry ingredients together and set aside. Cream the sugars, shortening, egg and vanilla together, until light and fluffy. Add the dry ingredients and work in good. Makes a stiff dough. Roll into balls the size of walnuts and roll in sugar. Place wide apart on greased cookie sheet. Bake at 375 degrees, maybe 10 minutes. Watch them and when they just begin to turn tan around the edges, take them out of the oven and leave on cookie sheet until they harden. They puff up when cooking, then fall.