Molcajete but not using a pestle

[lemons]

We have a resto in town that's making guac tableside on a cart, and instead of a pestle, they're using an unpeeled avocado. Tried to see if the same one was re-used, or split and used for the next batch, but couldn't get a good enough view. First-rate guacamole, to be sure, from a very simple recipe, but the usage (gloved hand, BTW) surprised me. Have I been missing something for all these years?

[lemons]

Well, that photo sure could be an avocado. I guess that's what it was.

You can always depend on CHers.

[Cheese Boy]

My guess is that what you saw was a lava rock pestle that looked very much like a Hass avocado. Like this one perhaps ... http://www.google.com/imgres?q=lava+p...

[thursday]

Are you sure it wasn't a pestle that looked like an avocado? I only ask because we own a molcajete (with pestle) and have repeatedly tried to cut into the pestle when making guac. Even in a pile of avocados, it looks just like one.