2 cups brown sugar
2 sticks butter
1/2 cup white karo
1/8 tsp. cream of tartar
1 tsp. baking soda

Mix brown sugar, butter, karo and cream of tartar. Bring to boil. Boil 5 minutes. Add soda and stir. It will foam up. Pour over 6 to 8 cups popped corn. Stir until well coated.

Bake at 200°F for about 1 hour. Stir occasionally.