Thoroughly clean the mackerel: remove the guts, head, and tail, then slice into smaller pieces.
In a large bowl, combine the water and salt, then add the mackerel slices. Let it stand for 1 hour to prepare the fish for pickling.
Rinse the mackerel with cold water, then place it in a sterilized jar, layering it with thinly sliced red onion, garlic, and dried chili peppers.
In a saucepan, bring to a boil the vinegar, water, brown sugar, bay leaves, black peppercorns, mustard seeds, caraway seeds, and fresh dill. Let it cool to room temperature.
Pour the cooled spicy pickling liquid over the mackerel, ensuring the fish pieces are completely submerged.
Seal the jar and refrigerate for at least 24 hours to allow the flavors to meld.
Before serving, let it stand in the refrigerator for at least 48 hours for the flavors to fully develop.
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