Thoroughly wash the mustard greens, discarding any tough stems.
Blanch the mustard greens in boiling water for 30 seconds, then immediately transfer them to an ice bath to stop the cooking process and maintain their crispness.
In a saucepan, combine the water, salt, sugar, and vinegar. Bring to a gentle simmer over medium heat, stirring until the sugar and salt are completely dissolved.
Pack the blanched mustard greens into a clean glass jar, layering with the garlic cloves, red chili flakes, sliced ginger, and black peppercorns.
Pour the hot brine over the mustard greens, making sure they are completely submerged. Use a weight (such as a small clean jar filled with water) to keep them down if necessary.
Allow the mixture to cool completely at room temperature, then seal the jar and refrigerate for at least 48 hours to allow the flavors to meld before enjoying.
The pickled mustard greens will continue to develop a more complex flavor over time. They can be stored in the refrigerator for up to two weeks.
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