At Saint Peter, a fish is treated the way a butcher might treat a side of beef: dry-aged in custom-built rooms, broken down whole, and used from scale to tail instead of being filleted and forgotten. The restaurant, set in Paddington, has built its reputation on this principle, turning techniques more commonly associated with meat into a vocabulary for seafood. The daily-changing offer reflects that morning’s catch rather than a fixed roster of dishes, so the line-up shifts with whatever has come in, while the underlying logic stays constant: nothing of the animal goes to waste. The kitchen has become known for its John Dory liver, served simply on toast, and for turning yellowfin tuna into unexpected forms, from a tartare on fermented rice cake to a wrapped pastry reminiscent of a Wellington, and even a petit four built from bone marrow. A recurring presence on the menu has been salt and vinegar mackerel, a dish that distils the kitchen’s interest in texture and preservation into something almost playful. Here, seafood cookery borrows its confidence from the butcher’s block: offal, bones and secondary cuts receive the same care as a prime fillet, and the results read as inventive rather than austere. Proceedings tend to open with a round of oysters and a changing raw selection, a reminder that the produce itself is never obscured by the technical ambition on show. Saint Peter has drawn recognition from the Good Food Guide and has featured on several best-restaurant lists since moving into the Grand National Hotel in Paddington, a heritage building that now houses its dining room. The eucalypt-toned space, hung with local artwork, offers a quieter backdrop to work this assured, and the service moves at a pace that matches the kitchen’s precision. Fish, here, is handled with the seriousness usually reserved for livestock, and the resulting plates make a case for seafood as a style of cooking with far more range than its reputation generally suggests.