Ingredients

1. 1/4 cup parsley leaves, chopped
2. 3 garlic cloves, minced
3. 2 teaspoons fresh rosemary, finely chopped
4. 1 teaspoon fresh thyme, chopped
5. 3/4 teaspoon dried lavender (optional)
6. One 4-pound boneless leg of lamb, trimmed of all fat
7. Salt and freshly ground pepper
8. 4 cups chicken stock or canned low-sodium broth
9. 1 teaspoon fennel seeds, lightly crushed 

Directions

1. In a small bowl, combine the parsley, garlic, rosemary, thyme and lavender. Spread the lamb on a work surface, boned side up and season generously with salt and pepper. Spread half of the herb mixture over the lamb and roll it into a roast. Tie the lamb with kitchen string at 1-inch intervals. Spread the remaining herb mixture all over the outside of the roast and season with salt and pepper. Let the roast stand at room temperature for 1 hour.
2. Meanwhile, in a large skillet, boil the stock over moderately high heat until reduced to 1 cup, about 30 minutes.
3. Preheat the oven to 450°. Set the lamb in a roasting pan and roast in the oven for 10 minutes. Reduce the oven temperature to 350°. Cook the lamb for 45 minutes longer, or until an instant-read thermometer inserted in the thickest part registers 125° for medium-rare or 140° for medium.
4. Transfer the lamb to a carving board, cover loosely with foil and let stand for 10 minutes. Add the fennel seeds to the roasting pan and cook over moderate heat until fragrant, about 1 minute. Increase the heat to high, add the reduced stock and cook, scraping up any browned bits on the bottom of the pan; season with salt and pepper.
5. Discard the string. Carve the lamb into thick slices and arrange on a platter. Pour any carving juices into the sauce, spoon it over the lamb and serve.

Make Ahead

The recipe can be prepared through Step 1 and refrigerated overnight. Bring the lamb to room temperature before roasting.