These get better the longer they sit in the fridge—and can be made in advance.
Pickled Red Onions
These are super easy to make, and the lime juice in the brine adds a citrusy brightness to whatever you put these on.
½ red onion, thinly sliced on a mandolin
Juice of 2 limes
¼ cup red wine vinegar
¼ teaspoon salt
Combine all ingredients, and let sit for at least 15 minutes. They will keep for a few days in the fridge and continue to get flavorful and pickle-y as they sit.