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