Grandpa's Popcorn Balls

• 2 cups white sugar
• 1 cup light corn syrup
• 1/2 cup butter
• 1/4 cup water

• salt to taste
• 1 teaspoon vanilla extract
• 1 teaspoon distilled white vinegar (optional)
• 5 quarts popped popcorn

1. In a saucepan over medium heat, combine the sugar, corn syrup, butter and water. Stir and heat to hard-crack stage or 300 degrees F (150 degrees C). Remove from heat, add vanilla or vinegar; mix well.
2. Pour slowly over popped popcorn while stirring. Wait 5 minutes and shape into 3 inch round balls.