Kahlua Popcorn

Kahlua Popcorn 2 quarts air popped popcorn 1 cup white sugar 1/2 cup Kahlua 2 tablespoons cider vinegar 3 tablespoons unsalted butter 3/4 cup roasted almonds Keep popcorn in shallow pan in oven to keep warm. Stir sugar, Kahlua, and vinegar in a pan on stove. Bring to a boil. Add butter. Bring to hard crack stage (300 degrees on a candy thermometer). Pour over warm popcorn and nuts, stirring to coat. Let cool. Store in airtight container. Allegedly will last several weeks. No one has shown enough self-restraint in my house to test this.