Beef Wellington with Root Vegetable Gratin

Dr. Sweetpea has been asking me to make Beef Wellington for him for moooooonnnnths. I've always been intimidated by the recipes I found online because they always seemed very labor intensive, but still gave Tyler Florence's recipe a try and it turned out fantastic. Also, as a side, I decided to make a root vegetable gratin since Dr. Sweetpea loves root vegetables. Needless to say, this is one of the most labor intensive meals that I've made at home but it was absolutely delicious. This was the perfect meal to eat around the holidays. Definitely a keeper for us.

Beef Wellington with Root Vegetable Gratin

(Source: Tyler Florence)

For the Duxelles:

3 pints (1 1/2 pounds) white button mushrooms

2 shallots, peeled and roughly chopped

4 cloves garlic, peeled and roughly chopped

2 sprigs fresh thyme, leaves only

2 tablespoons unsalted butter

2 tablespoons extra-virgin olive oil

Kosher salt and freshly ground black pepper

For the Beef:

1 (3-pound) center cut beef tenderloin (filet mignon), trimmed

Extra-virgin olive oil

Kosher salt and freshly ground black pepper

12 thin slices prosciutto

6 sprigs of fresh thyme, leaves only

2 tablespoons Dijon mustard

Flour, for rolling out puff pastry

1 pound puff pastry, thawed if using frozen

2 large eggs, lightly beaten

1/2 teaspoon coarse sea salt

Minced chives, for garnish

Green Peppercorn Sauce, recipe follows

Roasted Fingerling Potatoes

Warm Wilted Winter Greens, recipe follows

Green Peppercorn Sauce:

2 tablespoons olive oil

2 shallots, sliced

2 cloves garlic, peeled and smashed

3 sprigs fresh thyme, leaves only

1 cup brandy

1 box beef stock

2 cups cream

2 tablespoons grainy mustard

1/2 cup green peppercorns in brine, drained, brine reserved

For the Beef:

To make the Duxelles: Add mushrooms, shallots, garlic, and thyme to a food processor and pulse until finely chopped. Add butter and olive oil to a large saute pan and set over medium heat. Add the shallot and mushroom mixture and saute for 8 to 10 minutes until most of the liquid has evaporated. Season with salt and pepper and set aside to cool.

To prepare the beef: Tie the tenderloin in 4 places so it holds its cylindrical shape while cooking. Drizzle with olive oil, then season with salt and pepper and sear all over, including the ends, in a hot, heavy-based skillet lightly coated with olive oil - about 2 to 3 minutes. Meanwhile set out your prosciutto on a sheet of plastic wrap (plastic needs to be about a foot and a half in length so you can wrap and tie the roast up in it) on top of your cutting board. Shingle the prosciutto so it forms a rectangle that is big enough to encompass the entire filet of beef. Using a rubber spatula cover evenly with a thin layer of duxelles. Season the surface of the duxelles with salt and pepper and sprinkle with fresh thyme leaves. When the beef is seared, remove from heat, cut off twine and smear lightly all over with Dijon mustard. Allow to cool slightly, then roll up in the duxelles covered prosciutto using the plastic wrap to tie it up nice and tight. Tuck in the ends of the prosciutto as you roll to completely encompass the beef. Roll it up tightly in plastic wrap and twist the ends to seal it completely and hold it in a nice log shape. Set in the refrigerator for 30 minutes to ensure it maintains its shape.

Preheat oven to 425 degrees F. On a lightly floured surface, roll the puff pastry out to about a 1/4-inch thickness. Depending on the size of your sheets you may have to overlap 2 sheets and press them together. Remove beef from refrigerator and cut off plastic. Set the beef in the center of the pastry and fold over the longer sides, brushing with egg wash to seal. Trim ends if necessary then brush with egg wash and fold over to completely seal the beef - saving ends to use as a decoration on top if desired. Top with coarse sea salt. Place the beef seam side down on a baking sheet.

Brush the top of the pastry with egg wash then make a couple of slits in the top of the pastry using the tip of a paring knife - this creates vents that will allow the steam to escape when cooking. Bake for 40 to 45 minutes until pastry is golden brown and beef registers 125 degrees F on an instant-read thermometer. Remove from oven and rest before cutting into thick slices. Garnish with minced chives, and serve with Green Peppercorn Sauce, Roasted Fingerling Potatoes, and Warm Wilted Winter Greens.

Green Peppercorn Sauce:

Add olive oil to pan after removing beef. Add shallots, garlic, and thyme; saute for 1 to 2 minutes, then, off heat, add brandy and flambe using a long kitchen match. After flame dies down, return to the heat, add stock and reduce by about half. Strain out solids, then add 2 cups cream and mustard. Reduce by half again, then shut off heat and add green peppercorns.

Root Vegetable Gratin

(Source: Cooks Illustrated)

1 tablespoon plus 1 1/2 cups water

1 1/2 teaspoons Dijon mustard

2 teaspoons all purpose flour

Salt and pepper

2/3 cup dry white wine

1/2 cup heavy cream

1/2 onion, chopped fine

1 1/4 teaspoons minced fresh thyme

1 garlic clove, minced

2 pounds Yukon Gold potatoes, peeled and sliced lengthwise ⅛ inch thick

1 large celery root (1 pound), peeled, quartered, and sliced ⅛ inch thick

1 pound rutabaga, peeled, quartered, and sliced ⅛ inch thick

3/4 cup panko bread crumbs

1 1/2 ounces Parmesan cheese, grated (3/4 cup)

4 tablespoons unsalted butter, melted and cooled

Adjust oven rack to middle position and heat oven to 375 degrees. Grease 13 by 9-inch baking dish. Whisk 1 tablespoon water, mustard, flour, and 1 1/2 teaspoons salt in medium bowl until smooth. Add wine, cream, and remaining 1 1/2 cups water; whisk to combine. Combine onion, thyme, garlic, and 1/4 teaspoon pepper in second bowl.

Layer half of potatoes in prepared dish, arranging so they form even thickness. Sprinkle half of onion mixture evenly over potatoes. Arrange celery root and rutabaga slices in even layer over onions. Sprinkle remaining onion mixture over celery root and rutabaga. Layer remaining potatoes over onions. Slowly pour water mixture over vegetables. Using rubber spatula, gently press down on vegetables to create even, compact layer. Cover tightly with aluminum foil and bake for 50 minutes. Remove foil and continue to bake until knife inserted into center of gratin meets no resistance, 20 to 25 minutes longer.

While gratin bakes, combine panko, Parmesan, and butter in bowl and season with salt and pepper to taste. Remove gratin from oven and sprinkle evenly with panko mixture. Continue to bake until panko is golden brown, 15 to 20 minutes longer. Remove gratin from oven and let stand for 25 minutes. Serve.