Roasted Beef Tenderloin with Sherry Vinaigrette and Watercress

Preparation Preheat oven to 500°F. Rub 1 tablespoon olive oil into beef, then rub in kosher salt and ground mixed peppercorns. Place beef on small rimmed baking sheet. Roast 10 minutes. Reduce heat to 450°F and roast until thermometer inserted into thickest part of meat registers 125°F for medium-rare, about 15 minutes longer. Let meat stand 5 minutes (internal temperature of meat will increase 5 to 10 degrees). Meanwhile, whisk remaining 5 tablespoons olive oil, vinegar, and mustard in small bowl to blend. Stir in shallots and season vinaigrette to taste with salt and pepper. Arrange watercress on small platter. Cut meat into 1/2-inch-thick slices; arrange overlapping slices atop watercress. Drizzle any accumulated juices over meat. Spoon half of vinaigrette down center of meat and over watercress. Serve, passing remaining vinaigrette separately. Test-kitchen tip:

Preparation Preheat oven to 500°F. Rub 1 tablespoon olive oil into beef, then rub in kosher salt and ground mixed peppercorns. Place beef on small rimmed baking sheet. Roast 10 minutes. Reduce heat to 450°F and roast until thermometer inserted into thickest part of meat registers 125°F for medium-rare, about 15 minutes longer. Let meat stand 5 minutes (internal temperature of meat will increase 5 to 10 degrees). Meanwhile, whisk remaining 5 tablespoons olive oil, vinegar, and mustard in small bowl to blend. Stir in shallots and season vinaigrette to taste with salt and pepper. Arrange watercress on small platter. Cut meat into 1/2-inch-thick slices; arrange overlapping slices atop watercress. Drizzle any accumulated juices over meat. Spoon half of vinaigrette down center of meat and over watercress. Serve, passing remaining vinaigrette separately. Test-kitchen tip: