Pop all three bags of pop corn according to package directions. In a big roasting pan dump all the popped corn, being careful to remove all unpopped kernals (if you shake the bag gently most of the kernals will fall to the bottom and you can transfer the popped corn by handfuls into the roasting pan). In a sauce pan mix Sugar, Butter, Corn Syrup and Cream of Tarter together over a medium heat, add baking soda last and stir. Pour over the popped corn slowly stirring as you add. Bake at 250 degrees for 1 hour. Stirring every 15 minutes. Remove from oven and stir constantly until cool. This is one of my recipes to share with you!