4 qts. popped corn
1 c. firmly packed brown sugar
1/2 c. butter
1/2 c. Karo corn syrup
1/2 tsp. salt
1/2 tsp. vanilla
1/2 tsp. baking soda

In heavy saucepan stir together brown sugar, butter, Karo corn syrup and salt. Stirring constantly, bring to boil over medium heat. Without stirring boil 5 minutes. Remove from heat; stir in vanilla. Then stir in baking soda. pour syrup mixture over popcorn, stir to coat well. Bake in 250 degree oven, stirring occasionally, 1 hour. Remove from oven and cool.