Preheat oven to 350°F [170°C]).
Cream butter, shortening, brown
sugar and granulated sugar in large bowl. Add egg and vanilla; beat until light and fluffy.
Stir in
flour, baking soda, cream of tartar and salt just until
blended.
Shape dough into small balls (teaspoon/5 mL size) and dip
top half of ball in water then sugar. Place on wax paper
and using the bottom of a glass flatten slightly; transfer to
ungreased cookie sheets. Bake for 8-11 minutes or just until golden.
Cool 1 minute on cookie sheets. Remove to wire racks; cool
completely. Store in airtight container, or
freeze.
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