Mexican Mesquite Hardwood (Might be lump) charcoal at local Mexican Groceria question. The package is in Spanish so that doesn't help me as well as my Spanish is pretty bad. so I reduce myshelf to Sign language charades when talking to the help. I was there last week and they had fairly large bags for $4.99. I think 10lbs bags maybe larger. I have had a conversation with BobBrisket and he says it rocks. Can any other chime if you like it or not? i guess I could by a bg and smoke a couple fatties....