BEEF TENDERLOIN WRAPPED IN PASTRY RECIPES

Steps:

• Using kitchen twine, tie the tenderloin into a 12-inch log, folding the thinner end onto itself. (Use your hands to squeeze the meat into a log. You can be aggressive here.)
• Place pancetta in a cold 12-inch skillet. Cook over medium heat, stirring occasionally, until pancetta starts to brown, 6 to 8 minutes.
• Add butter, raise heat to high, and stir in mushrooms and shallot. Cook until the liquid released by the mushrooms has cooked off, 4 to 7 minutes. Reduce heat to medium and continue to cook until mushrooms are browned, stirring frequently, another 18 to 23 minutes. (Take your time here, you want a deep golden color for the best flavor.) Scrape bottom of the skillet as necessary to prevent burning.
• If the pan looks dry, drizzle in a little olive oil, then stir in garlic and thyme leaves. Cook until fragrant, another 1 to 2 minutes. Stir in sherry, scraping up the browned bits on the bottom of the pan. Scrape mixture into a medium bowl to cool. (Do not add salt at this point.)
• In the same skillet, heat 2 tablespoons olive oil over medium-high. Season beef generously with salt and pepper, then sear on all sides until browned, 1 to 2 minutes per side. Transfer to a plate, and cool slightly. Remove any twine. Brush meat all over with mustard.
• On a clean work surface, overlap long sheets of plastic wrap (about 15-by-15 inches). Place prosciutto slices on top to make about a 14-by-7-inch rectangle, arranging them in an even layer and overlapping the pieces slightly. Spread cooled mushroom mixture on top.
• Place beef along one long end of the prosciutto slices, and roll prosciutto tightly around beef. Wrap tightly with plastic wrap, twisting both ends like a candy wrapper. Chill in the refrigerator for at least 30 minutes and up to overnight.
• Meanwhile, heat oven to 400 degrees, and line a rimmed baking sheet with parchment paper. In a small bowl, whisk together egg and 1 teaspoon water. Lay puff pastry out on the prepared baking sheet, lightly draping over edges. (The pastry needs to be at least 14-inches long and 13-inches wide to cover the beef; if not, roll it out as needed.)
• Carefully unwrap and place chilled log along the edge of one long side of puff pastry. Roll beef up tightly, then place it seam-side down on the baking sheet. Tuck puff pastry over the ends of the beef to cover them, pinching to seal and folding underneath. Brush top and sides of pastry with egg wash, and use a small sharp knife to cut a few slits into the top of the pastry.
• Bake until a thermometer inserted in the center reads 115 degrees for rare, 25 to 35 minutes. (This timing will yield rare pieces at the thicker end and medium done pieces at the thinner end of the loin.) Remove from oven and let rest for 10 minutes, then slice and serve while warm.

Steps:

• For the mushroom mixture: In the bowl of a food processor, in two batches, pulse the mushrooms and shallots, until finely chopped, 12 to 15 times, stopping occasionally to scrape the sides of the bowl.
• Heat the olive oil in a large skillet over medium heat. Add the mushroom mixture. Cook, stirring often, until tender, beginning to brown and any moisture in the skillet has evaporated, 25 to 30 minutes. Add the garlic, thyme, salt and pepper. Cook, stirring often, for 1 minute. Stir in the parsley and remove from the heat. Let cool to room temperature, at least 30 minutes.
• For the Beef Wellington: Sprinkle the beef tenderloin all over with salt and pepper. In a large skillet over medium-high, heat the oil. Cook the beef tenderloin, turning occasionally, until browned on all sides, 10 to 12 minutes total. Remove the tenderloin from the skillet and set aside to cool for 30 minutes. Remove and discard the twine.
• On a clean work surface, overlap 2-3 pieces of plastic wrap to form a 22 x 18-inch rectangle. Lay the prosciutto slices on the plastic wrap, slightly overlapping each slice to form a 13 x 10 -inch rectangle in the center of the plastic wrap. Spread the cooled mushroom mixture evenly over the prosciutto. Rub the beef tenderloin all over with mustard and arrange lengthwise along the bottom third of the prosciutto rectangle. Using the plastic wrap as a guide, roll the beef tenderloin in the mushroom covered prosciutto to form a log. Wrap tightly in plastic wrap and chill at least 1 hour or up to 4 hours.
• Preheat the oven to 425°F. On a lightly floured surface, slightly overlap the 2 sheets of puff pastry and roll into a 15x12 -inch rectangle. Lightly brush the top third of a long side of the pastry with egg. Remove the plastic wrap from the beef tenderloin log and place the log lengthwise in the center of the puff pastry. Fold to completely seal the log in pastry, brushing any folds with egg to help them stick together and seal.
• Place the pastry wrapped tenderloin, seam side down, on a parchment-lined rimmed baking sheet. Brush the log lightly with the remaining egg. Using a small knife, cut 3 (1-inch) slits in the puff pastry to allow steam to escape. 
• Bake the Beef Wellington until the puff pastry is golden brown and a meat thermometer inserted in the center registers 120°F for medium-rare, 40 to 50 minutes, tenting with foil to prevent excess browning if needed. Remove from the oven and let rest at room temperature for about 15 minutes before serving.