Step 1

Place the very thinly sliced red onion packed tightly in mason jars. If desired, include whole black peppercorns, rosemary and garlic in the mason jars for additional seasoning to the onions.

Step 2

Add the water, vinegar, sugar and salt to a small saucepan over medium-high heat. Bring the mixture to a boil and stir until the sugar and salt are dissolved. Transfer the hot mixture to a measuring cup with a pour spout for easy pouring.

Step 3

Pour the hot liquid over the sliced onions, making sure to cover the onions completely. Tighten the lids on the jars of the onions and let them cool to room temperature. Place the jars in the fridge for about 24 hours to allow them to pickle and turn a deep pink color.

Step 4

Store the pickled onions in the fridge for up to 3 weeks. Enjoy!