If using dried seaweed, soak it in cold water for 10 minutes to rehydrate, then drain and rinse thoroughly.
In a saucepan, combine the vinegar, water, salt, and sugar. Bring to a gentle simmer, stirring until the sugar and salt dissolve.
Place the seaweed into a clean glass jar, layering it with garlic, red chili flakes, sliced ginger, black peppercorns, and sesame seeds.
Pour the hot pickling liquid over the seaweed, ensuring it is fully submerged.
Let the mixture cool to room temperature, then seal the jar and refrigerate for at least 12 hours before consuming.
The pickled seaweed will develop a more intense flavor over time and can be stored in the refrigerator for up to one week.
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