Caramel Popcorn

Coat a large roaster with non-stick spray and 

fill it with popped popcorn.  

Coat a pot with non-stick spray and add 1/2 cup corn syrup, 1 cup butter and 2 cups brown sugar. Melt together, stirring with a large spoon coated with non-stick spray.  Boil while stirring for 5 minutes.  Take off heat and stir in 1/2 tsp. baking soda, a pinch of salt and a pinch of cream of tartar.  

Pour over popcorn, mixing well.  Put roaster in oven for 2 hours, stirring every half hour.