Thoroughly rinse the salmon fillet under cold water and pat it dry with paper towels.
Using a sharp knife, slice the salmon thinly to speed up the pickling process.
In a sterilized jar, layer the salmon slices with the thinly sliced red onion and garlic cloves.
In a saucepan, bring the vinegar, water, brown sugar, salt, bay leaves, black peppercorns, mustard seeds, and dill to a boil. Allow to cool to room temperature.
Pour the cooled brine over the salmon, then add freshly squeezed lemon juice for extra flavor.
Seal the jar and refrigerate for at least 24 hours to allow the flavors to meld.
For the best flavor, let it stand in the refrigerator for at least 48 hours before serving.
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