Pickled onions are often useful as a garnish.  This version makes 2 cups and is adapted from 177MilkStreet.com

1 cup white vinegar

2 tsp. white sugar

2 tsp. kosher salt

2 medium red onions, halved and thinly sliced

1 jalapeno chili, stemmed, halved and seeded

In a small bowl, mix together the vinegar, sugar, and salt.  Add the onions and jalapenos and stir well.  Cover and refrigerate for at least an hour before using.