Roast Sirloin

Aloyau rôti teaches restraint before heat: leave the fat alone. The smaller undercut, or tenderloin, cooks more quickly than the broad upper loin, and its thick covering of fat is the shield that lets both muscles reach the table rosy and juicy. Trim that protection away and no clever timing will put the moisture back.

The grand kitchen assumed an enormous loin, a butcher who cracked the flat vertebral bones without detaching them, and a concentrated roasting fire tended throughout. For four, the honest equivalent is a two-bone joint prepared the same way, a steady conventional oven, and a thermometer placed in each muscle before the roast comes out. This entry called for no saucier, stockpot, or salamander, so neither will we. Only the brigade scale and the old fire arrangement have gone; the protective fat, attached bones, and patient heat remain. One cook, one stove, one evening.

The one step that decides the dish happens at the butcher's block, before your pan is warm. Ask for the undercut to remain attached and thickly covered, with only the loose excess of flank removed. A steady, concentrated fire follows, never a fierce one.