Heat 2 tablespoons of butter in a large skillet over medium heat. Season the filet with 1 tablespoon of salt and ¼ tablespoon of pepper and sear the filets in the butter (2 minutes on each side).
Chill the filet for at least 1 hour (or overnight).
In another pan, heat 2 tablespoons of butter and sauté the onion for about 4 minutes, add the spinach and cook for 10 minutes, add the Sherry and cook until the mixture is dry (about 4 minutes). Let cool.
On a floured surface, roll out the puff pastry and make a rectangle large enough to cover the filet.
Position the filet on the puff pastry and add half of the foie gras and half of the spinach sauce.
Carefully flip the filet and cover with the foie gras and sauce.
Take the puff pastry and, folding up the sides, cover and wrap the filet, brushing the edges with egg to seal properly.
Preheat the oven to 220°C and bake the filet for 40 minutes.
Allow the filet to cool for at least 10 minutes before slicing.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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