Cream together the butter, shortening, sugars, egg and vanilla by hand (no mixer!)

In a separate bowl mix together the flour, baking soda, cream of tartar and salt.

Add the dry mixture to the butter and sugar mixture and combine.

Cover bowl and refrigerate for 1-2 hours.

Preheat oven to 350 degrees Fahrenheit.

Roll dough into walnut-sized balls.

Dip half of ball in cold water and then in white sugar to form a glaze on top of the cookie.

Bake 9 to 11 minutes or until cookies are just barely turning brown around the edges. Do not over bake.