Fresh-water Trout

Truite au bleu (fresh-water trout poached blue) teaches the sharpest lesson in fish cookery: freshness is not decoration here, it is a working ingredient. Hot vinegar meets the trout's untouched natural coating and raises a blue-silver bloom, then a court-bouillon, the quick aromatic poaching liquor, cooks the flesh at scarcely a tremble. The result is delicate, clean, and generously buttered, with the skin itself proving how carefully the fish was handled.

The old formula assumed trout dispatched beside the stove, a long fish kettle, and hands free to clean and serve each one immediately. It needed neither a saucier on staff, a stockpot never off the fire, nor a salamander; its luxury was fish carried almost straight from cold, fast water. At home, ask the fishmonger to gut the trout without scaling, scrubbing, or rinsing them, collect them close to dinner time, and use a snug roasting pan in a low oven. The fish kettle and extra hands are brigade scaffolding; intact coating, hot vinegar, and gentle poaching are the dish.

The only modernization is equipment and scale: four portion trout go into one pan, and the low oven gives the same even, quiet heat without balancing a fish kettle across several burners. Nothing else is shortened. One cook, one stove, one evening. Before you touch the pan, protect that unwashed exterior; without it you may still have fine trout, but you do not have au bleu.