Any man who is both willing and able to produce a perfect lamb tagine on a barbecue is far from being an idiot in my eyes. You must let us have the recipe .....
okay probably perfect was thrown out there a tad quick..

I am not about to claim to have the perfect lamb tagine... but its pretty darn good, probably not strictly authentic..
what I do a bit differently works really well IMO, one of those things is in prep I will put peppercorns, rock salt and spices in a P&M and bash them up then put some of the toms(tinned) and give it a good mix, pour that into a clip n close tub with the rest of the toms and the fruit, close it up and shake.. I adopted this method as its easier when cooking outside..
to the BBQ, I have the coals on one side and only have the tagine(clay) above whilst browning the spice rubbed lamb, and the onion(which has had lemon juice and honey mixed into it half hour before) then I move the tagine to the side a bit, this gives a good heat for the rest of the cooking and also allows me to do the bread directly over the coals (simple flat bread flour, water, oil, salt, mixed, kneaded, film wrap, fridge, then rolled)
so I guess all the element get there in the end just in a slightly different way, really does help with what is needed to be carried outside.