1 large red onion thinly sliced
½ cup apple cider vinegar
¼ cup water
2 tablespoons red wine vinegar
2 tablespoons white vinegar
½ teaspoon kosher salt
Optional Add-Ins:
1-2 garlic cloves smashed
5-7 whole black peppercorns
1 bay leaf
Dried Chili Flakes
Fresh herbs
Cinnamon Sticks
Citrus Peel
Place thinly sliced onions into a mason jar or small bowl, if using right away.
In a small saucepan, vinegars, water, and kosher salt. If you are also including any optional add-ins, add them now. Bring to a simmer over medium-high heat and then pour pickling liquid and aeromatics into the same jar as onions while still hot.
Let sit 30 minutes.
Use immediately or cover and store in the refrigerator for later use.