Quick Pickled Red Onions are a fantastic topping to keep on hand in your refrigerator for a variety of uses. I like to use them on hamburgers, tacos, bratwurst, and even salads. Pickling onions is also a great way to use up the last of an onion without waste.
For this batch of onions, I chose to add mustard seeds. Feel free to add your own favorite flavors like garlic, bay leaf, or even chili. For best visual appeal, opt for whole seeds rather than ground spices, as they will cause the vinegar to cloud and look muddy.
After the first 24 hours of pickling in the vinegar mixture, your onions will turn a beautiful and uniform bright pink color. They make a great topping to many dishes, such as tacos, hamburgers, bratwurst, or even pizza!