and if you can, can you please tell me what it look like? (be descriptive)
It is when you take a double boiler and put water in the lower pan and what you are steaming in the upper pan. You put the upper pan on top of the lower pan and add heat. The water in the lower pan will generate steam that will steam cook what you have in the upper pan.
Sounds like you might be talking about a double boiler, or some form of one. A large pot on the bottom. Usually with a choice of either a colander (thing with holes in it) that fits on top, or a smaller pot that fits on it, both to be over the boiling water. Then a lid.
