Pickled Onions

• 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)

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Place sliced onions in jar. Bring all other ingredients to a simmer, and pour into jar. Allow to cool 20–30 minutes, then cover and refrigerate until needed.