Fresh pretzels can be reheated by placing in a microwave and heating in 10-12 second increments. Frozen pretzels are best heated in an oven - Preheat oven to 425℉. Place frozen pretzels on a baking pan. Sprinkle with a small amount of water and coarse salt. Bake for 6-8 minutes or until pretzel is crisp on the outside and feels soft inside when lightly pressed.