what constitutes as "burnt" does the pie have to be on fire? does the top of the pie have to be burnt? how much of the pie has to be black? etc. in cooking mama it always burns the same way but Irl isn't cooking mama unfortunately

As long as the pie is reasonably burnt, it's ok. The pie does not have to be on fire. Its not supposed to be super serious. The only thing we are super serious about is if you injure yourself or others during the run its automatically invalided, don't hurt youself over this meme.