PREP: This individual Beef Wellington recipe isn’t particularly difficult, but success lies in paying attention to the details. Before you start cooking, take the time to read this recipe entirely and watch the video included below. Then, prep the following:

• Bring the beef to room temperature: 20-30 minutes before you’d like to begin cooking, pull the beef tenderloin out of the refrigerator to come to room temperature before searing. 
• Thaw the puff pastry: Similarly, if using frozen, thaw the puff pastry, if frozen. You can thaw frozen puff pastry overnight in the refrigerator or set it on the counter at room temperature 20-30 minutes before you’d like to begin cooking.
• Chop the mushrooms: Working in batches as necessary, place the cleaned and trimmed mushrooms in a food processor and pulse, scraping down the sides as needed, until finely chopped. 

For the Individual Beef Wellington:

1. Sear the beef tenderloin: Add the oil to a large skillet over medium-high heat. Use paper towel to pat the surface of the beef tenderloin as dry as possible, then season with the kosher salt and ground black pepper. Once the oil is hot and shimmering, add in the beef tenderloin. Cook 2-3 minutes per side until deeply browned. Transfer the seared beef tenderloin to a plate or cutting board and set aside to rest for 20-25 minutes before slicing into 4 individual steaks, roughly 7 ounces each.
2. Make the mushroom duxelles: Use paper towel to carefully wipe out the skillet used in Step 1, above, then return to the stove over medium heat, adding the butter. Once melted, add in the chopped mushrooms and shallot. Season with kosher salt and fresh thyme, stirring to combine. Cook, stirring occasionally, for 10-15 minutes, until all of the water is cooked out of the mixture. Slowly add in the wine, using a wooden spoon to scrape up any browned bits that may have formed on the bottom of the skillet. Continue to cook, stirring occasionally, for an additional 10-15 minutes more, until all of the wine is cooked out of the mixture. Remove from the heat and set aside to cool.
3. Individual Beef Wellington assembly: Gather the remaining ingredients and assemble the mini Beef Wellington: [gallery columns="2" size="medium" ids="13982,13984,13985,13986,13987,13988,13989,13990"]
   1. Roll out the puff pastry: Lightly dust a work surface with flour. Carefully unfold the puff pastry, then slice in half vertically and horizontally, creating 4 equal pieces of puff pastry. Gently roll out each piece into a roughly 7×7 square. Set aside. 
   2. Layer the prosciutto and mushroom duxelles: Arrange 2 pieces of prosciutto side-by-side, slightly overlapping at their edges to create one thin layer of prosciutto. Press the duxelles over top, into a thin, even layer covering the surface of the prosciutto. Since prosciutto is so delicate, it can be helpful to arrange these layers on a piece of plastic wrap (pictured above) or parchment paper to prevent it from sticking to your work surface.
   3. Brush the seared beef tenderloin generously with Dijon mustard, then place it atop the mushroom duxelles on the prepared layer of prosciutto.
   4. Wrap the beef tenderloin with the prosciutto and duxelles: Fold the sides of the prosciutto up towards the steak, then roll the steak forward as tightly as possible, completely encasing the steak in the prosciutto and duxelles. (See photos, above.) The prosciutto acts as a protective barrier between the juicy steak and mushrooms and the crispy puff pastry, so take your time to carefully ensure the entire surface of the steak and mushrooms are covered by prosciutto. 
   5. Fold the prosciutto-wrapped beef tenderloin into puff pastry: Set the prosciutto-wrapped steak in the center of a piece of puff pastry. Brush the edges of the puff pastry with egg wash to help seal the mini Beef Wellington pocket. Fold the corners of the puff pastry over the top of the beef tenderloin, tucking the sides in as you go to completely encase the steak with the puff pastry. (See photos, above.)
   6. Repeat Steps 3.1-6 with the remaining steaks.
   7. Chill: Place the assembled individual Beef Wellington on a sheet pan. Transfer to the freezer to chill for 25-30 minutes. 
4. Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper for easy cleanup, then arrange the chilled Beef Wellington over top. Generously brush egg wash over the surface of each individual Beef Wellington, then finish with a generous sprinkling of coarse sea salt, as desired.
5. Bake the individual Beef Wellington for 25-35 minutes, until the puff pastry is golden brown and the steak has reached your preferred doneness. The best way to measure doneness is to probe an instant-read thermometer into the side of the Beef Wellington. Look for an internal temperature of 120 degrees for rare, 130 degrees for medium-rare, 140 degrees for medium, and so on. Remove from the oven and set aside to rest for 5-10 minutes before serving – the internal temperature will continue to rise to the final temperature as the Beef Wellington rest.
6. Serve the individual Beef Wellington with desired side dishes – mashed potatoes, crispy mushrooms, etc. Enjoy!