Putting on a fire on a grill is Libun. Once it gets very hot, it’s koshered. Bread, dairy, treif, it’s all the same.
Vicki Hoffstein 
Sharon Hazan 
Maccabee Gabay
Clean it, fire it up till it’s real hot, and it’s good to go.
Hi rabbi what about if I put buns directly on the grill. Would the laws of libun apply?
Thank you
Putting on a fire on a grill is Libun. Once it gets very hot, it’s koshered. Bread, dairy, treif, it’s all the same.