Prepare a
grill for high indirect heat (for a charcoal
grill, bank coals on one side of
grill; for a gas
grill, leave one or two burners off); oil grate. Scrape excess marinade from lamb;
grill over direct heat, turning every minute or so and moving to indirect heat as needed, until deeply browned and an instant-read
thermometer inserted into thickest part registers 130° for medium-rare, 6–8 minutes. Transfer to a platter and let rest 5 minutes.