This easy canning recipe for pickled onions is the perfect way to preserve your garden harvest (or that big bag of onions you couldn’t resist at the store). Tangy, crisp, and just a little bit sweet, these shelf-stable pickled onions are made with red, white, or yellow onions and a simple vinegar brine. Great for topping burgers, tacos, salads, and more—they’re a pantry favorite all year long. No pressure canner needed!