I don't have a dehydrator, solar or anything of the kind...but i'd like to dehydrate minced onions in the oven...I just dried a bunch of mushrooms that way, and wonder if there is a way to keep the onions fron sticking to the pan. I didn't have that problem with the mushrooms after i switched them from the pan to cake cooling racks. Or should I dry them in whole slices, then crush them?