How to Make It
Preheat the oven to 250° and position racks in the upper and middle thirds. Toss the popcorn with the roasted peanuts in a large heatproof bowl.
In a large saucepan, combine the brown sugar with the butter, agave nectar, corn syrup and salt and bring to a boil, stirring until the sugar is completely dissolved. Boil over moderate heat for 4 minutes. Remove from the heat. Using a long spoon, stir in the baking soda and tequila; the syrup will foam. Immediately pour the hot syrup over the popcorn and peanuts and, using 2 spoons, toss to coat thoroughly.
Spread the popcorn on 2 nonstick baking sheets and bake for about 1 hour, stirring occasionally and switching the sheets halfway through, until golden and nearly dry. Turn off the oven, open the oven door completely and let the popcorn cool completely before serving.
Agave nectar (also called agave syrup) is a liquid sweetener made from the agave plant. Look for it in health-food stores.