Here's how many Koreans eat garlic on charcoal grill and it's beautiful. You make a little bowl out of aluminium foil and put sliced (not too thin) garlic inside, then put some sesame oil inside. (about 1/3 level of garlic) Then put it on top of grill. Let it sit for a good 10 or so minutes. (stir it up as needed) Garlic will boil inside the oil and will result in awesome soft and sweet garlic without any burnt marks. =)

EDIT: I have uploaded the photo to an image host.