Tournedos Lesdiguières

Tournedos Lesdiguières (grilled tenderloin on spinach-filled onion cases) teaches synchronization. The one true thing to know before touching a pan is that tenderloin forgives no delay: the onions, spinach, and Mornay must be hot and ready before the beef meets the grill.

The source kitchen assumed a saucier on staff, stocks never off the fire across the sauce station, a salamander for glazing, brigade portions, and another cook watching the grill. This recipe itself reaches for finished Mornay rather than stock, so the honest home equivalents are one prepared cup of sauce, a fierce household broiler, and a ridged cast-iron pan. Four portions replace the brigade batch because this is one cook, one stove, one evening.

The separate sauce station and extra hands were scaffolding, and they can go. The construction must stay: onions parboiled nearly tender and hollowed into cases, filled two-thirds with creamed spinach, capped with Mornay, glazed fiercely, then crowned with grilled tournedos. Have every onion hot and bronzed before the beef finishes resting. That timing decides the dish.