So I've read a lot about using onion skins for stock and such, and I'd like to start doing this for myself. But I have a question:
Quite often, between the layers of skin, there is this black powdery stuff. I'm guessing it's some kind of mold. How do you deal with removing that? Do you need to? Is a rinse under running water sufficient? Should you wash it off before or after the skins get saved and frozen?
Thanks for your help!