Ingredients
Method
Prepare the Beef
- Remove beef from refrigerator 30 minutes before cooking to bring to room temperature. Season all sides generously with salt and pepper.
- Heat olive oil in a large cast iron or heavy skillet over medium-high heat until shimmering. Sear the beef on all sides until golden brown, about 2-3 minutes per side.
- Transfer beef to a plate and let cool completely. Once cooled, brush all sides with Dijon mustard. Set aside.
Make the Mushroom Duxelles
- Heat olive oil in the same skillet over medium heat. Add minced garlic and cook for 30 seconds until fragrant.
- Add chopped mushrooms, thyme, salt, and pepper. Cook, stirring frequently, until mushrooms release their liquid and it evaporates, about 12-15 minutes.
- Add red wine and cook until completely evaporated, about 2-3 minutes. The mixture should be dry and concentrated.
- Transfer to a plate and let cool completely before using.
Assemble and Bake
- Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.
- Roll out puff pastry on a lightly floured surface to accommodate the beef with 2-3 inches of pastry on all sides.
- Spread the cooled mushroom duxelles in the center of the pastry, leaving borders for wrapping.
- Place the mustard-coated beef on top of the mushroom mixture. Brush the pastry edges with beaten egg.
- Carefully wrap the pastry around the beef, sealing the seam and ends. Place seam-side down on the prepared baking sheet.
- Brush the entire pastry with egg wash and score decorative lines on top if desired.
- Bake for 25-30 minutes until pastry is golden brown and internal temperature of beef reaches 125°F for medium-rare.
- Let rest for 10 minutes before slicing with a sharp knife.
Notes
For best results, use a meat thermometer to check doneness. The beef will continue cooking slightly while resting. Can be assembled up to 4 hours ahead and refrigerated before baking - just add 5 minutes to cooking time if baking from cold.
