How to Make It
Put the lamb into a 2-gallon resealable plastic bag. Add the wine, rosemary, thyme, zest, shallots, peppercorns and lavender. Seal the bag, pressing out the air. Turn to coat the lamb. Refrigerate for at least 24 hours and up to 48 hours, turning the bag occasionally.
Drain the lamb, picking off any solids from the marinade. Return to room temperature.
Light a grill and oil the grates. Brush the lamb with oil and season with salt. Grill over moderate heat, turning occasionally, until an instant-read thermometer inserted into the thickest part registers 125° for medium-rare meat, 35 to 40 minutes. Transfer the lamb to a board and let rest for 10 minutes. Thinly slice the meat against the grain and serve.