7 hour lamb? There's something to be said for 35-minute lamb too. (35 min cooking time anyway).
Rub a butterflied leg with a paste of fresh rosemary, basil, garlic, kosher salt and fresh ground pepper, wrap it up and chuck it in the fridge overnight.
Start up coals on half a Weber-type (lidded) grill. Drop the lamb on when hot, searing one side to a crust (5 min or so). Flip, sear other side.
Pull the meat to the cool side, where there are no coals underneath. Put the cover on and let it roast to smoky perfection -- about 25 min more for med rare most cases.
This recipe has converted more than one "I don't like lamb" person.