Sweet pickle fly trap! 1. Buy a jar of sweet pickles. 2. Eat the pickles and save the juice. 3. Make four holes in the lid using a Phillips head screwdriver and a hammer. The holes should be big enough for flies to enter. 4. Place the jar where you want to catch flies and wait two days for results. Tip: Dill pickles wont work; it must be sweet pickles to attract the flies. You can use a mix of apple cider vinegar, water, and sugar, but the sweet pickle brine is easier and a great way to repurpose it during BBQ season.