cooking with sand

much of the buckwheat out there as food is toasted,
it is why it has such a strong flavor,
if you don't like the strong flavor of it, then use the non toasted kind,
but have you ever wondered how buckwheat is toasted ?
you can just put it in a pan and keep stirring as you add heat,
but that is not how it is usually done,
they mix it with sand,
and cook it in the hot sand,
just keep stirring it and the sand distributes the heat incredibly evenly,
then you just use a screen to recover the buckwheat from the sand,

it leaves me wondering what else I can cook in sand.