Thoroughly wash the sea cucumber in cold water, then cut into smaller pieces.
Blanch in boiling water for 2-3 minutes, then immediately transfer to an ice bath to preserve its texture.
Place the sea cucumber pieces, thinly sliced garlic cloves, and bay leaves into a sterilized jar.
In a saucepan, bring the vinegar, water, brown sugar, salt, black peppercorns, mustard seeds, and dill to a boil. Let it simmer for a few minutes, then remove from heat and allow to cool to room temperature.
Pour the cooled brine over the sea cucumber, ensuring it's completely submerged.
Seal the jar and refrigerate for at least 24 hours to allow the flavors to meld.
For the best flavor, let it sit in the refrigerator for at least 48 hours before serving.
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