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In a large bowl, cream together the shortening and sugars with an electric mixer on high.
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Add egg, vanilla, salt, baking soda and cream of tartar.
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Mix on high until smooth and well incorporated.
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Add flour and mix well.
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Preheat oven to 300°F and let the dough rest in the fridge for 30-60 minutes.
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In a small bowl, combine sugar and cinnamon for topping.
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With your hands, roll the dough into balls about the size of a golf ball.
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Roll the balls in the cinnamon/sugar mixture and press them into an ungreased cookie sheet.
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Bake for 10-14 minutes and NO LONGER! They will seem undercooked, but will be soft and chewy in the middle once they have cooled. Don't overbake and then come to me with a bad review because they weren't delicious :).