1 cup butter
½ cup corn syrup
2 cups brown sugar
½ teaspoon grey sea salt
2 pinches (or to taste) of red pepper flakes
1 cup unpopped popcorn
1 teaspoon vanilla
½ teaspoon baking soda
Pop corn with air popper. Place the popped popcorn into large roaster pan.
Preheat the oven to 250 degrees F. Combine the brown sugar, corn syrup, butter, pepper flakes and salt in a saucepan. Bring to a boil over medium heat, stirring enough to blend. Once the mixture begins to boil, boil for 5 minutes while stirring constantly.
Remove from the heat, and stir in the baking soda and vanilla. The mixture will be light and foamy. Immediately pour over the popcorn in the pans, and stir to coat. Don't worry too much at this point about getting all of the corn coated.
Bake for 1 hour, removing the pans, and giving them each a good stir every 15 minutes. Line the counter top with waxed paper. Dump the corn out onto the waxed paper and separate the pieces. Allow to cool completely, then store in airtight containers or resealable bags.