Freezer instructions: Arrange uncooked folded dumplings in a single layer on a parchment-lined baking sheet. Freeze for 2 hours until solid, then transfer to a zip-top freezer bag. Cook from frozen — no thawing needed, just add 2 extra minutes to the steaming step. Storage: Cooked dumplings keep in the fridge in an airtight container for up to 3 days. Re-crisp in a lightly oiled skillet over medium heat for 2 to 3 minutes. Vegetarian option: Substitute pork with a mix of pressed crumbled firm tofu, finely chopped shiitake mushrooms, and soaked glass noodles.