Oil or water work just fine for me, and I think I read somewhere that acidic ingredients interfere with smoke absorption, and mustard is acidic. However, you don't taste the mustard anyway.
On my last competition I decided to just use water. It worked out great. I would add rub then sprits with water, add rub more sprits. I did this until I got the amount of rub on it I wanted. It could be a coincidence but I won first place.
If not cooking outdoors, I am cooking on the stovetop with my 14" carbon steel wok, 12" CI skillet, or in the oven with my two Lodge CI pizza pans, or two dutch ovens. I've also got a nifty Lodge carbon steel grill pan that rocks for veggies outdoors.
Mustard used as a binder has such a minimal amount of contribution to flavor you will never notice it on ribs or butts. That said, you are better with water or olive oil.
I advise you to read (or re-read) Meathead 's write up on the science of rubs. He discusses this very topic in depth.
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