Kamado flashback is a sudden burst of flames caused by oxygen entering the grilling chamber when the lid is opened. To prevent this from happening, it is important to “burp” your kamado before opening the lid. To do this, open the bottom vent and then slowly lift the lid an inch or two and allow air to circulate inside the grilling chamber for about 10 seconds. After the oxygen has had time to enter the grill, you can safely open the lid.