Caramel Popcorn
["3 qt. popped popcorn (must be air popped popcorn)", "1/2 c. butter", "1/4 c. Karo syrup", "1/2 tsp. vanilla", "1 c. brown (light or dark) sugar", "1/2 tsp. salt", "1/4 tsp. baking soda", "1/2 c. chopped nuts (walnuts or pecans are best)"]
["Preheat", "oven to 300\u00b0.", "Put popped corn on cookie sheet (nonstick", "is", "best).", "Remove", "all unpopped kernels.", "Sprinkle chopped", "nuts", "over popcorn.", "Melt butter in heavy saucepan on low heat.", "Stir in brown sugar, Karo and salt.", "Bring to boil on medium", "heat.", "Do", "not", "stir.", "Boil 4 minutes, no more, no less. Remove", "from", "heat.", "Stir", "in", "baking soda and vanilla. Pour mixture over popcorn.", "Stir until coated.", "Will not coat completely.", "Place", "in", "hot oven (middle rack) for 15 minutes. Take out.", "Stir again until all popcorn and nuts are completely coated.", "Then bake for 15 minutes longer.", "Empty onto foil. Let cool", "completely.", "Break", "into pieces.", "Place in airtight container."]
["must", "butter", "syrup", "vanilla", "brown", "salt", "baking soda", "nuts"]