Chateaubriand: To merit this designation, you must imperatively serve a thick slice of beef tenderloin heart cut to (3.5 cm thickness minimum)

The béarnaise sauce (tarragon, chervil, shallot) is made in a bain-marie just 10 minutes before serving. Fingerling potatoes or olive-shaped potatoes (3 cm) need 5 minutes blanching then 15 minutes roasting in foaming butter. The trick: pull the meat from the fridge 10 minutes ahead, sear 2 minutes per side, then rest covered on an upturned plate for 7 to 8 minutes to keep the center rare and warm.
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Ingredients for 4 servings

servings
  1. 4 beef tenderloin hearts of 7.75 oz (220 g) (approximately)
  2. 17.75 oz (500 g) of Noirmoutier potatoes or potatoes turned into olive shapes of approximately 3cm
  3. 4.25 oz (120 g) of butter
  4. 1 drop of grape seed oil
  5. 1/4.25 qt (4 liter) of béarnaise sauce
  6. salt and ground pepper