For the onions
01 -
1 large red onion, about 10-12 oz (280-340 g), thinly sliced
02 -
1 garlic clove, peeled and lightly smashed, optional
03 -
1/2 teaspoon black peppercorns, optional
04 -
1/4 teaspoon chili flakes, optional
For the brine
05 -
3/4 cup (180 ml) white vinegar or apple cider vinegar, 5% acidity
06 -
3/4 cup (180 ml) water
07 -
1 1/2 tablespoons granulated sugar
08 -
1 1/2 teaspoons kosher salt