Sweet Popcorn Balls

Preparation

1. Pop popcorn and put in a large bowl.  Set aside for use later.
2. Mix syrup, brown sugar, water and vinegar in a saucepan. Cook over medium heat, stirring constantly until mixture boils.  Continue cooking and stirring almost constantly about 15-20 minutes on medium heat. Cook to hard ball stage (until a small amount of mixture forms a hard ball when tested in very cold water.)
3. Remove from heat, quickly add butter, and stir.
4. Slowly pour mixture over popped popcorn in a large bowl, while mixing well.  Form into balls, using as little pressure as possible.
5. Wrap each popcorn ball in plastic wrap and store in an airtight container.