Shiela's Sugar Cookies

Preheat oven to 350 degrees F (175 degrees C). Grease cookie sheets.

In a large bowl, cream together the 1 cup margarine, shortening, white sugar and 1 cup confectioners' sugar until smooth. Beat in the eggs one at a time, then stir in 1 teaspoon lemon juice. Combine the flour, baking soda, cream of tartar and salt; gradually stir into the creamed mixture. On a lightly floured surface, roll the dough out to 1/4 inch in thickness. Cut into desired shapes with cookie cutters. Place cookies 1 1/2 inches apart onto prepared cookie sheets.

Bake for 8 to 10 minutes in the preheated oven. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.

To make frosting, combine the 3 cups confectioners' sugar, 1/4 cup margarine and 1 1/2 teaspoons lemon juice in a medium bowl. Mix until smooth, adding milk 1 tablespoon at a time until frosting has reached its desired consistency.