We are thinking of buying one of those table 'induction' heaters to cook a
Japanese type of vegetable meal actually on the dining table.

The cast iron pot traditionally used for this is one that we already have.
It is though designed for use over a *gas* burner and it does not have a
*flat* bottom. So the surface area in contact with the induction heater
would be much reduced.

The pot looks like a miniature witches cauldron with a curved bottom and
three tiny little stumpy legs to rest on. The fact that the pot surface
area in contact with the induction heater surface is reduced to three little
legs, would that mean that electricity is actually being wasted in heating
such a pot or is it that it just would not heat up very much using an
induction heater ? Thanks for any advice.