🧅 Easy Pickled Red Onions Recipe 🧅

Ingredients:
- 1 large red onion, thinly sliced
- 1 cup vinegar (white, apple cider, or rice vinegar)
- 1/2 cup water
- 1/4 cup sugar
- 1 tsp salt
- 1/4 tsp black peppercorns
- 1/4 tsp mustard seeds
Directions: