Prepare the brine: In a small saucepan, combine water, vinegar, lime juice, sugar, salt, garlic, and chili flakes. Bring to a gentle simmer until sugar dissolves. Let it cool completely.
Arrange the avocado slices: Place avocado slices into a clean mason jar, layering with cilantro leaves if desired.
Pour the brine: Pour the cooled brine over the avocados, ensuring they’re fully submerged.
Seal and refrigerate: Close the jar tightly and refrigerate for at least 2 hours, preferably overnight, to let the flavors meld.
Serve: Enjoy these tangy, flavorful pickled avocados as a topping or side dish.
