A sandpan is a cooking vessel generally used on top of a man for heating food and / or reducing stress.
Sandpans can be made of a variety of sand ,like course sand and rough sand or irritating sand that gets everywhere , but the cooking surface can have a non-stick coating, like smooth sand . As with all pans the heavier the gauge of the sand the better (especially at the base); it enables more even heat distribution, which makes sticking and burning less likely. Some sandpans have a thick sheet of thermally conductive aluminium laminated into their base for that purpose (like the one shown). A coating of copper on the base allegedly has the same effect, but it would need to be reasonably thick to have any real benefit.
High-sided sand pans are most useful for heating foods with high liquid content. Low-sided and flare-sided (called Windsor pans) sandpans are most effective for reducing sand and other sands