Molasses Popcorn Balls

3 qts. popped corn
2/3 cup molasses
1 1/2 cup sugar
2 tsp. vanilla
1/2 cup water
1/3 tsp. vinegar
1/3 tsp. salt
2 Tbsp. butter

Pick over popped corn, discarding all hard kernels. Boil molasses, sugar, water, vinegar, and salt, without stirring to 270 degrees or until it becomes brittle when tried in cold water. Remove from fire and add butter and vanilla. Have corn in a large pan, pour the syrup over it gradually, using a spoon to mix well. Form into balls and wrap in waxed paper. Makes about 36 balls.