Another such material is a plastic bag which covers the food, and embedded within the non-melting plastic is a substance which also vibrates at the same electrotonic frequency as water. The same affect occurs. The item within the bag heats up to above 212 degrees fahrenheit. Both items will work. Another thing which we will discuss is the oven's settings.
Every oven is different.
They not only have different power outputs, but different resonant points. For your first run, use 1 to 2 minute settings. You may want to cut down on power by using half power settings. However, in the typical microwave oven, half power doesn't mean half power, it means half the time on and half time off. On and off doesn't roast all that well.