Crunchy Carmel Corn

1 cup butter
2 cups brown sugar
½ cup Karo syrup
1 tsp. salt
1 tsp. vanilla
1/2 tsp. baking soda

Melt butter and stir in brown sugar, karo and salt. Stir until mixed only. Boil all ingredients for 5 minutes without stirring. Remove from heat and slowly stir in vanilla and soda. Stir until foamy. Pour over 6 qts. of popped popcorn. Bake at 250° for 1 hour. Stir once or twice while baking. May use popcorn that comes already popped in the big bags.