Blacken on a grill is a cooking technique that involves heating food over an open flame or hot coals. To blacken on a grill, one must first SEAR the food, which is done by quickly cooking it over high heat. This is followed by charring the food, which is done by cooking it over a lower heat for a longer period of time. Finally, the food is cooked on a SPIT, which is a metal rod that rotates the food over the heat source. The most popular type of grill used to blacken food is the Weber grill, which is a charcoal or gas-powered grill.