In Alton Brown's cookbook, he describes the time he was preparing to grill some tuna steaks. He's a hardwood charcoal fan, and uses one of those [link|http://www.pans.com/products/lodge-camp-dutch-oven-charcoal-chimney-starter-6496.html|charcoal chimney starters]. Apparently the trick to grilling tuna is to go as hot as possible, as close to the coal as you can get, just long enough to barely blacken the outside -- which would be crusted with black pepper and sesame.
So he's waiting to hear the characteristic jet-engine sound that means the chimney has done its thing. He's just about to pour the charcoal into his classic Weber kettle grill when he thinks, "Hmm, the top of that chimney looks pretty hot." So he takes the grill off a small portable kettle, puts the tuna on it, and sets it directly on top of the chimney. Less than 30 seconds on each side and it was done.
Now I've never had a grilled tuna steak, I don't usually cook with charcoal, and I don't even have one of those chimney things. But I want to go buy all the hardware just so I can try this.