Hi.

Which metal made thick walled container, [not foil] about the size of a coffee cup with a lid can be put in a microwave oven so the metal will heat up, heating its content by convection inside ?

 

Would an iron, stainless, aluminium, brass, copper... cup work without damaging the oven nor making fireworks ? Or some other material that will absorb oven microwaves ?

 

Would its shape spherical, no sharp edges... be preferred ?

Hi.

Which metal made thick walled container, [not foil] about the size of a coffee cup with a lid can be put in a microwave oven so the metal will heat up, heating its content by convection inside ?

 

Would an iron, stainless, aluminium, brass, copper... cup work without damaging the oven nor making fireworks ? Or some other material that will absorb oven microwaves ?

 

Would its shape spherical, no sharp edges... be preferred ?

 

While I do know that you can put limited amounts of metal in a microwave (small piece of aluminum foil, for example, or for instance the left over rims of those microwavable soup cups (http://www.campbellsoup.com/Products/Microwavable/All/11669 for example) I'm not sure an entire box made of metal that your food goes inside would either work or be safe to use.