There's quite a bit of research literature on the phytocompounds in onions and their scaly outer skins, David.
This Overview from the onion trade organization contains a lot of scholarly references at the end.Here's another reference to check out:
Antibacterial and antioxidant activities of quercetin oxidation products from yellow onion (Allium cepa) skin
In commercial food-processing operations, onion skins are often characterized as industrial waste. Of course, the processors would be eager to find profitable uses for them:
Characterization of industrial onion wastes (Allium cepa L.): dietary fibre and bioactive compounds.
There's quite a bit of research literature on the phytocompounds in onions and their scaly outer skins, David.
This Overview from the onion trade organization contains a lot of scholarly references at the end.Here's another reference to check out:
Antibacterial and antioxidant activities of quercetin oxidation products from yellow onion (Allium cepa) skin
In commercial food-processing operations, onion skins are often characterized as industrial waste. Of course, the processors would be eager to find profitable uses for them:
Characterization of industrial onion wastes (Allium cepa L.): dietary fibre and bioactive compounds.