Note: this is an American recipe, but I have used British cups and it has turned out fine.

Pre-heat oven to 200C/400F. Mix thoroughly butter, shortening, 1 1/2 cups sugar and the eggs. Blend in flour, cream of tartar, baking soda and salt. Shape into balls bigger than a quarter, but smaller than a 50p.

Mix 2 tablespoons of cinnamon and 2 tablespoons of sugar together in a small bowl. Rough balled cookies in the cinnamon/sugar mixture and place 2 apart on an ungreased cookie sheet. Bake 8-10 minutes or until set. Remove immediately to wire rack or grease proof paper to cool.

Makes nearly 6 dozen.