Pickled Onions

Ingredients

• 1 medium red onion, very thinly sliced
• ½ cup water
• ¼ cup distilled white vinegar
• ¼ cup apple cider vinegar, rice, wine, or additional white vinegar
• 1½ tablespoons honey or other sugar
• 1½ teaspoons salt
• ¼ teaspoon red pepper flakes (optional, for heat)