Take a leg of lamb, stab it all over filling the holes with fresh garlic and fresh rosemary
If you can do this the night before but not absolutely necessary
Pop it in the weber and cook it slowly using indirect heat for 2 or 3 hours....
then grease a pan and pop in some roast potatoes and let them roast on the grill for an hour or so. If that's too much hassle then tatties in tinfoil directly on the coals for about an hour or so with a turn now and again
I've had the lamb in a fresh roll... My mouth is watering now...
To accompany this dish; red wine of your choice and good company