They might have even more recommendations over at !books@lemmy.world.
I agree that the flat surface looks like a comal but it’s way too small. There’s no way that someone would ever want to use a comal that’s only 4". Tortillas take a few minutes to cook or even reheat. Heating a single tortilla at a time for a family, let alone a business, would be frustrating.
I don’t have any experience with cooking on stone but I would assume that it would leave some kind of discoloration.
Edit: It does resemble Texas Pink Granite so maybe there are similar rocks in Mexico near the Texas border.
Kenji Lopez-Alt
You’re welcome!
I thought it was an interesting cave so I felt like sharing.