Like Baked Alaska, Beef Wellington is old-school restaurant fare that deserves a second look. It’s not nearly as hard to make as it seems, and you can’t help but think special occasion when you see it.
Tie the tenderloin with kitchen string in four places so that it holds its cylindrical shape while cooking. Rub it all over with olive oil, then season it liberally with salt and pepper. Heat a large, heavy skillet over high heat and when hot add the beef and sear on all sides, including the ends, until well browned. Don’t skimp on this, it’s an important flavor-building step. Set the meat aside on a platter to cool.
Combine the mushrooms, shallots, and garlic in a food processor. Pulse until finely chopped. Add the butter and
Spread a 1½-foot piece of plastic wrap on your work surface and arrange the prosciutto on top, overlapping the slices in a rectangle large enough to wrap around the beef tenderloin. Use a rubber spatula to cover the prosciutto evenly with a thin layer of the mushroom duxelles. Sprinkle the duxelles with salt, pepper, and the remaining
On a lightly floured surface, roll the puff pastry out to about a ¼-inch thickness. (Depending on the size of your sheets you may have to overlap 2 sheets and press them together to fully enclose the meat.) Remove the plastic from the chilled beef and place the roll in the center of the pastry. Bring the long sides up over the beef, enclosing it completely, brushing the seam with egg wash to seal. Trim the ends if necessary, then brush with egg wash and fold over to completely seal the package. Place the beef seam side down on a greased baking sheet and chill for 1 to 2 hours. Reserve the egg wash, covered, in the refrigerator.
Preheat the oven to 425°F. Brush all of the pastry with the reserved egg wash, then cut a couple of slits in the top to allow the steam to escape as the beef cooks. Roast for 40 to 45 minutes, until the pastry is golden brown and the beef registers 125°F on an instant-read meat thermometer. Let the beef Wellington rest for 15 to 20 minutes before cutting into thick slices. Serve with the mushroom gravy.
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