- 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 at 420°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 20 inches x 12 inches. Lay undercrust over a baking sheet covered with parchment paper. Set beef tenderloin in its center, foie gras pate, leeks mixture and mushrooms.
- Whisk egg with milk and brush lightly periphery of undercrust.
- Set over rest of pastry into a rectangle large enough to cover all beef tenderloin and undercrust.
- Set a second pastry layer over tenderloin while being careful to center. Seal sides with your fingers. Oven bake 20 minutes. Reduce oven at 350°F (180°C) and bake for 10 minutes.
- Cool down 5 minutes before serving.
Chef’s note
To chose a good quality of foie gras pate (take a look at fine meats). Serve with roasted vegetables and rosemary, take a look at recipe: Oven roasted leeks mignons