The evening before:
1 In an airtight container, place your four beef steaks, salt and pepper them, place a beautiful truffle slice on each one, then pour a little grape seed oil over them. Close your container and keep it in the refrigerator.
2 Cut the remaining truffle into thin small batons (julienne), place in a small bowl and pour the red port over it. Cover with plastic wrap and keep refrigerated.
One hour before serving:
3 Take a thick-bottomed sauté pan, add a few knobs of butter and a drop of oil and heat until it reaches a golden brown color.
4 Meanwhile, drain and pat dry the beef steaks and the four truffle slices.
5 In the sauté pan, sear the tournedos for two minutes on each side, according to your preferred cooking level, to give them a nice color. Then remove them to a plate away from the heat (on an upside-down plate) and cover them with aluminum foil to keep them warm.
6 Heat some water for a bain-marie to keep your sauce warm once it's ready.
7 Remove some fat from the sauté pan and put it back on the heat. When it's hot, pour in the port without the truffles and, with a whisk, scrape up the pan drippings, then add the veal stock and let it reduce for two minutes.
8 Strain the sauce through a fine sieve, chinois with cheesecloth, and keep it warm in the bain-marie with a knob of butter on top.
9 10 minutes before serving, place your seasoned foie gras slices in the freezer.
10 When serving time comes, heat a nonstick pan and place your foie gras slices in it without any fat. Give them color on both sides, about one minute on each side, season with salt and pepper, then place them on absorbent paper.
11 In a sauté pan, reheat the sauce, add the truffle julienne, a few drops of lemon juice (3 or 4) and the beef tenderloin pieces, basting them. If they've released any juices, add those too. Remove the meat pieces according to your preferred cooking level.
12 Place your foie gras slices in the hot oven for 3 minutes.
13 Now you can plate. On beautiful warm plates, place the toast, then the beef tenderloin heart in the center, topped with foie gras, coated with hot truffle sauce and finished with a beautiful truffle slice. You can serve as a side dish beautiful Pont-Neuf potatoes, puffed potatoes, or quenelles of mashed potatoes.
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