Enjoy this tangy, slightly sweet condiment over rice and vegetables, in an omelet or tucked into your favorite sandwich.
1 cup rainbow chard stems, chopped (Chopped stems pickle quicker, but long spears can work also.)
Kosher salt
2 teaspoons mustard seeds
½ teaspoon peppercorns
¼ cup white wine vinegar
¼ cup rice vinegar
3 tablespoons raw cane sugar
1 small shallot, sliced
1 garlic clove, sliced