I was pretty interested in this cooking rig. It is supposedly a slab of volcanic pumice that is suspended over a propane flame. The pumice is heated and used as the cooking surface. We have seen pumice used as grill bricks. It certainly can take the heat, think volcanoes. Now seeing a slab of pumice as a griddle sparks the questions. First, where can we get pumice slabs? Does pumice transfer heat in an ideal way for cooking? Or is this just a novel way to create a portable cooking surface at a farmers market?