I use this with MAP fuel from Home Depot https://www.amazon.com/Bernzomatic-TS8000-Intensity-Trigger-Start/dp/B0019CQL60
Benzomatic TS8000 with the large camping propane tanks and if you really want to do it right, add a searzall.
Kenji's steak advice (Step 10A) is to use the torch WHILE finishing on your castiron - Which i find helps a LOT.
Ooo I like this question. Here's my list of unconventional must-haves.
Haha right on...just didn't know if I'm like giving myself cancer or something unknowingly. It does have many a warning on the bottle but I figured what torch doesn't. I'd highly recommend one of these bad boys...sturdy and long lasting, very fast heating, one-time $45 fee then $8 per canister (which lasts forever) after. Only thing is it ain't too small and portable.