It was made by crafting fire blocks. I tried and apparently cannot do this anymore.
Also, I mean no offense to any of you guys, but this is what happened through most of yesterday.
Notch: I'm almost done with Hell generation! Only a few more days before the update!
Notch: hmm, maybe that name should be changed...
Atheist: OMG YOU loving STUPID CHRISTIANS GETTING BUTTHURT ABOUT EVERYTHING YOU'RE ALL SO DUMB
Christian: Actually, I'm not even offe-
Atheist: SHUT UP YOU STUPID RELIGIOUS PERSON I HOPE YOU GET KILLED
Christian: But I don't even care about the-
Atheist 2: YEAH LISTEN TO THAT GUY YOU'RE ALWAYS RUINING OUR GAMES WITH YOUR STUPID BELIEFS
Notch: Yup, I'm changing it.