Thoroughly wash the fresh jalapeños, then slice them into thin rings.
In a saucepan, combine the vinegar, water, salt, and sugar. Bring to a simmer over medium heat, stirring until the sugar and salt are completely dissolved.
Pack the sliced jalapeños into a clean glass jar, layering them with the garlic cloves, black peppercorns, bay leaves, and red chili flakes.
Pour the hot pickling liquid over the jalapeños, making sure they are fully submerged.
Allow the mixture to cool to room temperature. Then, seal the jar and refrigerate for at least 24 hours before enjoying.
The pickled jalapeños will develop an even more intense flavor as they sit. They can be stored in the refrigerator for up to two weeks.
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