Using a air popper, pop corn into a large bowl, pick out any popped kernels.
Place butter and balsamic vinegar into a deep bowl and microwave it for 30 to60 seconds until butter is melted. Whisk the butter and vinegar together and drizzle slowly all over the popcorn. If you get too much in one spot it will be chewy and shrivel.
As soon as the popcorn is coated with vinegar sprinkle the salt and dill evenly and shake to coat.