Making homemade pickled red onions is so easy and only takes a few minutes! You will love having a jar of these around! Not only they have this gorgeous vibrant pink color, but they are tangy, packed with flavors, and they add a nice crunch factor to your dishes.
Thinly slice the red onion and place in a glass jar. Add mustard seeds, peppercorn, or any spices you would like to add.
In a saucepan, add water, vinegar, sugar, and salt. Heat over medium heat, and stir to help dissolve the sugar and salt. Once ready, let it cool for 10 to 15 minutes.
Once the brine cooled down a bit, pour it over the onions. Set down the jar, to cool at room temperature.
Once the jar is cool enough, close the lid and place in the fridge for at least 30 minutes to 1 1 hour or until the onions are bright pink and slightly tender.