These easy quick pickled red onions are the ultimate secret weapon, instantly elevating dishes ranging from Pork Carnitas, to burgers, to grain bowls, to salads and much more (see below!). They have the most incredible flavor from a few secret ingredients, including cinnamon, peppercorns and allspice berries (if you can’t find allspice berries you can omit them, but I do suggest giving them a try). You can eat the pickled onions after they sit, or you can refrigerate them for up to 3 weeks—they get even more flavorful with time.
Do Ahead: The pickled onions can be refrigerated for up to 3 weeks.