Potted Fresh Fish

The extended brining draws moisture from the fish through osmosis while seasoning it deeply, which helps preserve the texture during the long cooking time. The vinegar-water mixture creates an acidic environment that denatures proteins gently and acts as a preservative, while the tightly sealed vessel traps steam to maintain constant moisture and prevent the fish from drying out. The low, slow cooking essentially confit-style poaches the fish in its own juices with the vinegar solution, breaking down connective tissue while the spices penetrate throughout, creating a tender, sliceable terrine when chilled.