1 cup butter, softened
1 cup powdered sugar
1 cup granulated sugar
2 large eggs
1 cup vegetable oil
2 teaspoons vanilla extract
1 tablespoon fresh lemon juice
5 1/4 cups all-purpose flour
1 teaspoon cream of tartar
1 teaspoon baking soda
1/4 teaspoon salt
Colored sugar
Beat butter at medium speed with an electric mixer until fluffy; add powdered and granulated sugars, beating well. Add eggs, oil, vanilla, and lemon juice, beating until blended. Combine flour and next 3 ingredients; gradually add to sugar mixture, beating until blended.
Shape dough into 1-inch balls; roll in colored sugar, and place about 2 inches apart on lightly greased baking sheets.
Bake, in batches, at 350 degrees for 9 to 11 minutes or until set. (Do not brown.) Remove to wire racks to cool.
