- Season beef tenderloin with salt and pepper. In a large pan, at high heat, brown beef tenderloin over all sides. Remove from pan and set aside. In the same pan, brown leeks and mushrooms with olive oil for 2 to 3 minutes. Cool down. Preheat oven to 425°F (220°C).
- Slice puff pastry in two portions, if needed. Over a lightly floured surface, set down a portion of pastry into a rectangle of 50 cm x 30 cm (20 inches x 12 inches). Lay the pastry over a baking sheet covered with parchment paper. Set beef tenderloin in its center, along with foie gras pate, leek mixture and mushrooms.
- Whisk the egg with milk and brush the periphery of the pastry.
- Set over the rest of the pastry into a rectangle large enough to cover all beef tenderloin and the pastry.
- Set a second pastry layer over tenderloin while being careful to center. Seal sides with your fingers. Oven bake for 20 minutes. Reduce oven to 350°F (180°C) and bake for 10 minutes.
- Cool down for 5 minutes before serving.
Chef’s note
To choose a good quality of foie gras pate (take a look at deli meats in your favourite grocery store). Serve with roasted vegetables and rosemary, take a look at the recipe: Oven roasted leeks mignons.