Place unsalted butter in a cold pan. Place pan over medium heat. Cook butter, stirring often, until it browns evenly, about 2 minutes. Take care not to move the pan too much when stirring. Once butter is browned, remove from heat. Add lemon zest to the browned butter. Pour the butter-lemon mixture over popcorn and toss. Sprinkle 2 teaspoons sugar over the popcorn mixture and toss again. Serve.

Yield: 4 servings
Prep time: 5 minutes
Inactive prep time: 0 minutes
Cook time: 10 minutes