Tournedos à la Moelle

Ingredients

Equipment Needed

• •14-inch / 36 cm cast-iron griddle or two heavy skillets
• •2-quart / 2 L saucepan for poaching
• •Small saucepan for Sauce Bordelaise
• •Instant-read thermometer
• •Thin-bladed knife
• •Slotted spoon
• •Kitchen twine
• •Oval serving platter

Instructions

1. 1

   Soak and shape marrow

   Cover the marrow bones with cold water and soak them in the refrigerator for 2 hours, changing the water once, until the exposed marrow looks pale rather than blood-dark. Run a thin knife around each cylinder and push the marrow gently from the bone. Chill the cylinders for 20 minutes so they firm, then cut four large rounds about ½ inch / 1 cm thick. Keep them cold in fresh water. If a cylinder breaks, don't discard it. Ça se rattrape: gather the largest pieces and poach them together, then spoon a generous mound onto the steak instead of forcing a perfect round.

   Straight shaft bones release clean cylinders. Knuckle bones taste fine but give fragments, which makes the large classical slice needlessly difficult.
2. 2

   Ready sauce and service

   Put the Sauce Bordelaise in a small saucepan and warm it over low heat until glossy and barely stirring at the edge. Do not boil it. If it reduces too far, loosen it with a teaspoon of hot water; if a butter-finished sauce shows oily streaks, take it off the heat and whisk in a teaspoon of cold water until it comes together. Fill the serving platter and four dinner plates with hot water, let them stand for several minutes, then dry them thoroughly. This replaces the salamander without holding the beef under heat.

3. 3

   Heat the grill

   Set a wide cast-iron griddle or grill pan over high heat for 5 to 7 minutes. It must be thoroughly heated before the tenderloin arrives, because a modest pan cooks the center before it browns the surface. Meanwhile, bring a saucepan of salted water to just below a simmer for the marrow. Hold it there, with only an occasional tremble at the bottom.

4. 4

   Grill the tournedos

   Dry the tournedos thoroughly, tie each around its circumference, and season with about one-third of the salt and all the pepper. Brush both sides lightly with clarified butter. Lay all four on the griddle and listen for an immediate, hard hiss. If there is only a weak sizzle, lift them at once, let the iron recover, blot the meat again, and begin anew. Ça se rattrape. Grill without pressing or shifting for about 3 minutes, turn once, and cook the second side for 2 to 3 minutes. Brown the narrow edges briefly if needed. Remove the steaks at 122 to 125°F / 50 to 52°C for medium-rare, then rest them for 5 minutes. Tenderloin carries little fat, so use the thermometer and don't make it prove its courage.

   If your cooking surface cannot hold four steaks without crowding, use two heavy pans over two burners. Cooking in leisurely batches makes the first tournedos wait, and waiting is precisely what this dish forbids.
5. 5

   Poach the marrow

   While the beef rests, season the poaching water with the remaining salt and lower in the marrow rounds. Poach below a simmer for 1½ to 2½ minutes, until the edges turn opaque and the centers quiver while still holding their shape. Lift them carefully with a slotted spoon and drain briefly on a clean towel. If fat begins beading heavily from the surface, remove the marrow at once; it is beginning to melt. Broken pieces still belong on the steak, generously spooned rather than fussed into shape.

6. 6

   Crown and serve

   Remove the strings and arrange the four tournedos in a close ring on the warmed platter, the crown specified by the dish. Lay one poached marrow round on each steak. Spoon the glossy Sauce Bordelaise around the tournedos without drowning their browned tops, or send the sauce separately in a warmed sauceboat, exactly as the original service allows. Carry it straight to the table. À table!

Chef Tips

• •Ask for four center-cut tournedos of equal thickness, not four steaks of merely equal weight. Uniform thickness lets them finish together, which matters more here than an extravagant pedigree.
• •Ask the butcher for straight marrow bones and, if possible, to loosen or extract the marrow cylinders without splitting them lengthwise. The dish wants a broad slice on each steak, not roasted marrow scraped from a canoe-cut bone.
• •Sauce Bordelaise remains a finished component because that is how the source treats it. Rebuilding an entire stock and sauce family inside this entry would be brigade scaffolding; warming the proper finished sauce is the honest home translation.
• •A thermometer is not timidity. Tenderloin gives few visual warnings between rosy and dry, and the marrow and sauce leave no time for guesswork.
• •Pour a structured red Bordeaux, especially a Médoc or Graves style. The wine's grip suits the marrow, while its dark fruit follows the Bordelaise without turning dinner heavy.

Advance Preparation

• •The Sauce Bordelaise can be prepared up to 3 days ahead, chilled promptly, and reheated over low heat. Keep it covered closely so the surface does not form a skin.
• •The marrow bones can soak overnight in the refrigerator. Extract and slice the marrow up to 4 hours before dinner, then keep the rounds submerged in fresh cold water.
• •Tie and dry the tournedos up to 4 hours ahead and refrigerate them uncovered. Season only as the griddle heats. Do not grill the beef or poach the marrow in advance; those last minutes are the dish.

Frequently Asked Questions

Nutrition Information

1 serving (about 215g)