Peel the green outer skin from the watermelon rind, leaving only the white part. Cut the white portion into bite-sized pieces.
In a saucepan, combine the vinegar, water, salt, and sugar. Bring to a gentle simmer over medium heat, stirring until the sugar and salt are completely dissolved.
Place the watermelon rind pieces into a clean glass jar. Layer them with the garlic cloves, black peppercorns, bay leaves, cinnamon stick, and red chili flakes.
Pour the hot brine over the watermelon rind, making sure they are fully submerged. Press down gently to release any trapped air.
Let the mixture cool completely to room temperature. Seal the jar tightly and refrigerate for at least 24 hours before serving to allow the flavors to meld.
The pickled watermelon rind will continue to develop a more intense flavor as it sits. It can be stored in the refrigerator for up to two weeks.
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