Ingredients

  • 1/3 cup coarsely chopped shallots
  • 1/2 cup crushed garlic cloves
  • 1/3 cup each thyme leaves, parsley leaves and chopped rosemary
  • 3 tablespoons Dijon mustard
  • 1/3 cup plus 1/4 cup extra-virgin olive oil
  • 1 stick plus 2 tablespoons unsalted butter, at room temperature
  • One 5-pound well-trimmed boned and butterflied leg of lamb
  • Kosher salt
  • Pepper
  • 2 pounds cherry tomatoes
  • 2 thyme sprigs
  • Chunky olive butter, for serving

Method

  • In a blender or food processor, combine the shallots, garlic, thyme, parsley, rosemary, mustard and 1/3 cup of the olive oil; blend until smooth.
  • Transfer to a bowl and stir in the butter.
  • Arrange the lamb fat side down on a rack set over a rimmed baking sheet.
  • Spread the herb butter all over the lamb, leaving a 1-inch border.
  • Refrigerate until the butter is semifirm, 30 minutes.
  • Roll up the lamb with the butter inside and tie securely with kitchen twine at 1-inch intervals.
  • Cover and refrigerate overnight.
  • Preheat the oven to 400.
  • Rub the lamb with 2 tablespoons of the oil and season with salt and pepper.
  • Roast for about 1 hour and 45 minutes, until an instant-read thermometer inserted in the thickest part registers 130 for medium-rare.
  • Transfer the lamb to a cutting board and let rest for 20 minutes.
  • Leave the oven on.
  • On a rimmed baking sheet, toss the tomatoes with the remaining 2 tablespoons of olive oil and the thyme sprigs and season with salt and pepper.
  • Roast for 20 minutes, stirring, until softened.
  • Discard the strings and thinly slice the lamb.
  • Serve with the roasted tomatoes and olive butter.