Pickled Red Onions are tangy, sweet, and add flavor to salads, tacos, sandwiches, bowls, and more. They are easy to make at home, you only need 5 ingredients! We ALWAYS have a jar in the refrigerator!
To slice the onion, cut it in half to create half-moons. Use a very sharp knife or mandoline to create uniform, thin slices. You want the slices to be about 1/8-inch thick.
In a medium jar or bowl, combine the vinegar, warm water, sugar, and salt. Stir until sugar and salt dissolve.
Add the red onion slices and stir, making sure the onion is covered. Let sit for 30 minutes at room temperature.
Serve immediately or store in the refrigerator in a sealed jar or container for up to 3 weeks.
Notes
Keep pickled red onions in a jar or air tight container in the fridge for up to 3 weeks.