Caramel Popcorn
["1 c. butter", "2 c. brown sugar", "1/2 c. light Karo syrup", "1 tsp. salt", "1 tsp. vanilla", "1/2 tsp. baking soda", "6 qt. popped popcorn", "nuts (optional)"]
["Boil butter, sugar, syrup and salt for 5 minutes.", "Remove from burner.", "Add baking soda.", "Stir (mixture will foam up). Add vanilla and pour over popped corn.", "Bake in a 250\u00b0 oven for 1 hour, stirring every 15 minutes."]
["butter", "brown sugar", "light Karo syrup", "salt", "vanilla", "baking soda", "popcorn", "nuts"]