Thanks for the tips so far, guys.
I'll figure out a way to ask him without sounding like I'm digging for his life's secret or something. I've mentioned the great flavor and he beamed with pride while stating something about not serving anything he would not want to eat himself and quality, etc, etc. He seemed pleased that I appreciated noticing it. I gotta be able to tactfully segue.
The thing that I'm concerned with him/them becoming less comfortable with me buying a block of cheese once a month than anything else. We were talking a bit about dough and I mentioned AT. He seemed surprised that I could find a pizzeria to sell me a bag before I told him about Red Hill Country Store.
Anyhow, he never came out and said what he used. but I found out the next time I went there, I saw bags of it on a rack inside of a doorway that is normally closed down the hallway towards the rest rooms. I figured if he wanted to say anything else about what he used that it would have come up when we were talking about it.
Jonas, I saw some avocado oil in a store recently and though of how a few forum members liked it. We have a Trader Joe's, but I keep forgetting about looking there for stuff. I almost never get over on that side of town.
Norma, I saw your accounts of dumpster diving in a thread right after joining. Such dedication.
I had to remind myself that you post pictures of what you use all the time before asking about your current sauce in another thread. I asked someone else something one time who had reasons for not sharing with anyone, which was cool, but I've felt rotten about asking ever since. (the person shall remain nameless)