Char-Logs: AKA Gatling Barrels or Robot Turds.
They are perfect for Hibachi type grilling. (I set up a hibachi type grill, using firebricks, on my kettle).
I've used the coco-shell variety many times for h'n'f grilling. I like 'em. I've also used the binchotan type too. They burn hot, hot...