3 cups sugar
1/2 tsp cream of tartar
Dash salt
1 egg
4-5 cups flour
coarse decorating sugar (if desired)
Beat butter with an electric mixer for 30 seconds. Add sugar, cream of tartar, and salt; beat until combined. Add egg; beat until well combined. Beat in as much flour as you can, then stir in enough remaining flour to make a stiff dough. Divide dough into thirds. Shape into logs about 1 1/2 inches in diameter and 9 inches long; wrap and chill until firm, about 1-3 hours. Preheat oven to 375. Cut rolls into 1/4 inch thick slices and arrange 1 inch apart on an ungreased cookie sheet. Sprinkle with decorating sugar, if desired. Bake until bottoms and edges are golden brown, 8-10 minutes.
Makes about 60 cookies.