Old-Fashioned Popcorn Balls
["2 qt. popped corn", "1 c. Karo syrup", "1 c. brown sugar, packed", "1/4 c. water", "2 Tbsp. margarine", "1 tsp. white vinegar"]
["Place popcorn in a large, buttered bowl.", "In heavy 2-quart saucepan, stir together syrup, water, brown sugar and vinegar. Stir constantly over medium heat until mixture boils.", "Continue cooking, stirring occasionally until temperature on candy thermometer reaches 260\u00b0 or until a small amount of mixture dropped into very cold water forms a ball.", "Remove from heat; stir in butter.", "Slowly pour over popcorn.", "Make balls."]
["corn", "syrup", "brown sugar", "water", "margarine", "white vinegar"]