I don’t see any good reason why anyone would ever want to set peanut brittle on fire. It’s seems like an unnecessary waste. I mean I don’t think peanut brittle is that great -although I do enjoy it from time to time. But it just seems wrong to set it on fire. Probably dangerous too. I assume that it’s not very flammable but if you are setting brittle on fire, you are probably setting other things on fire too, and that’s not safe.