FILLING THE TRAYS:

If you’re cooking food that might stick or leave an odor, such as dumplings or fish, line the bottom of the tray with perforated parchment paper, napa cabbage, or banana leaves. Then add the food, with similar cook times, in an even layer, to each tray. Foods like dumplings need to be spaced about a 1/2- inch apart so they don’t stick together, and to allow air to circulate. Cover the top layer with the lid.