Instructions: Sift the flour, baking soda, cream of tartar, and salt together.

Cream butter, vanilla, and lemon zest together until butter is softened. Add sugar gradually into butter mixture, creaming until fluffy after each addition. Add yolks one at a time, beating well after each addition. Add dry ingredients, one fourth at a time, beating until just blended. Make 1 inch balls and place about 2 inches apart on ungreased cookie sheets. Bake at 350F degrees for 10 minutes or until golden brown.

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