Ingredients for 4 servings

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