Preheat oven to 375.
Beat the butter and sugar until creamy.
Add baking soda, cream of tartar and zest of 1 orange and mix well.
Beat in egg and vanilla until combined.
Add flour in parts until it is all combined.
Cover dough and chill in refrigerator for 1 hour (or freezer for 20 minutes).
Combine 2 tablespoons of sugar and cinnamon in a flat bottom bowl (or a pie pan).
Roll dough into 1 inch balls, then roll in cinnamon sugar mixture to coat.
Place on ungreased cookie sheet and bake for 10-11 minutes.
Cool on a wire rack.
1/2 cup salted butter
1 cup sugar
1/2 teaspoon baking soda
1/4 teaspoon cream of tartar
1 teaspoon vanilla
1 1/2 cups all purpose flour
Zest of 1 orange (zest two if you want some extra zest to top your cookie)
2 tablespoons sugar
1 teaspoon cinnamon