If using dried seaweed, soak it in cold water for 10 minutes to rehydrate. Drain well and rinse thoroughly.
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.
Pack the seaweed into a clean glass jar, layering it with the garlic, red chili flakes, sliced ginger, black peppercorns, and sesame seeds.
Pour the hot brine over the seaweed, ensuring it is fully submerged. Gently press down on the seaweed to release any trapped air bubbles.
Allow the mixture to cool to room temperature. Seal the jar tightly and refrigerate for at least 12 hours before serving to allow the flavors to meld.
The pickled seaweed will continue to develop a more intense and complex flavor as it sits. It can be stored in the refrigerator for up to one week.
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