1 (7 oz.) bag buttered popcorn
2 sticks butter
1 tsp. vinegar
2 c. firmly packed brown sugar
1/2 c. syrup (dark Karo)
1/4 tsp. baking soda
1 tsp. vanilla
1 c. Spanish peanuts

Set popcorn aside in a large shallow pan. Boil together butter, sugar and vinegar for 5 minutes; remove from heat and add syrup, soda, vanilla and peanuts. Pour over popcorn and stir until well coated.

Bake 1 hour at 275°F to 300°F, stirring every 15 minutes.