2 lbs trimmed beef tenderloin ( trim fat) coarse salt freshly ground black pepper 2 tbsp unsalted butter
1 small onion, finely chopped 2 cups mushrooms finely chopped 1/4 cup dry sherry 1 lb frozen puff pastry, thawed 4 oz chicken or goose liver pate at room temperature 1 large egg, lightly beaten all purpose flour for rolling pastry sea salt for sprinkling (optional)
Instructions
Season the beef's surface with salt and pepper. Put it in a heated skillet with butter and sear side and ends, for about 1 1/2 minutes each. Place tenderloin in fridge until cool. Put onion, mushrooms, salt and pepper in skillet and cook until almost tender. Add sherry and cook until no liquid remains. Season to taste and let cool. On a floured surface, roll puff pastry until 1/4 inch thick and large enough to cover beef. Spread tenderloin with pate and the mushroom mixture on alternating sections. Fold up dough to enclose tenderloin and chill for a half an hour. Brush with egg. Cook at 425F (230C) for 30 minutes to reach an internal temperature of 135F ( 57C)