Pan-Roasted Beef Tenderloin with Rosemary and Garlic

The red wine for the sauce is reduced to concentrate its flavor. To enrich the sauce, you can also add a bit of Dijon mustard.
Ingredients:

    1 beef tenderloin roast, 2 1/2 to 3 lb.
    3 fresh rosemary sprigs
    1 garlic clove, minced
      Salt and freshly ground pepper, to taste
    1 Tbs. vegetable oil
    4 shallots, minced
    2 cups dry red wine
    16 Tbs. (2 sticks) softened unsalted butter, cut
      into 1/2-inch pieces

Directions:
Preheat an oven to 400ºF.

Let the roast stand at room temperature for 30 to 40 minutes. Set the roast on a clean work surface and lay the rosemary sprigs lengthwise along the roast. Using kitchen twine, tie the rosemary to the roast at 2-inch intervals. Rub the roast with the garlic and season with salt and pepper.

Preheat an oval skillet or large sauté pan over medium-high heat and warm the vegetable oil. Add the roast and brown, 3 to 4 minutes per side. Transfer the skillet to the oven and roast, turning the beef occasionally, until an instant-read thermometer inserted into the center of the meat registers 125ºF for very rare to rare, 15 to 20 minutes, or until done to your liking. Transfer the roast to a cutting board, cover loosely with aluminum foil and let rest for 5 minutes.

Meanwhile, in a saucepan over medium-high heat, combine the shallots and wine and boil until reduced to 1/4 cup, 7 to 10 minutes. Add the butter a few pieces at a time, whisking constantly until blended before adding more. Strain the sauce through a fine-mesh sieve and season with salt. Keep warm over very low heat, being careful not to boil.

Slice the meat and arrange on a warmed platter. Pass the sauce alongside.
Serves 4 to 6.
Williams-Sonoma Kitchen.