Popcorn Balls

½ lb popcorn

2/3 c white corn syrup

2 c sugar

2/3 c boiling water

2 t cream of tartar

2 T vinegar

2 T melted butter

2 t vanilla

1/8 t baking soda

Pop corn and place in large pan.  Combine syrup, sugar, water and vinegar and heat to a boiling.  Add cream of tartar.  Boil to crack stage (270-280).  Remove form heat.  Add butter, baking soda, and flavoring.  Pour over popcorn and form into balls.