"Onion" sounds just beautiful. Is it available for standalone purchase?
I don't think so: it was published originally in Wrong Things (2001) with Billy Martin, reprinted in The Year's Best Fantasy and Horror: 15th Annual Collection (2002) by Ellen Datlow and Terri Windling, which is where I first encountered it, collected in To Charles Fort, with Love (2005), and collected again in Two Worlds and In Between: The Best of Caitlin R. Kiernan, Vol. 1 (2011). If any of these are in your library, go for it!
no subject
I don't think so: it was published originally in Wrong Things (2001) with Billy Martin, reprinted in The Year's Best Fantasy and Horror: 15th Annual Collection (2002) by Ellen Datlow and Terri Windling, which is where I first encountered it, collected in To Charles Fort, with Love (2005), and collected again in Two Worlds and In Between: The Best of Caitlin R. Kiernan, Vol. 1 (2011). If any of these are in your library, go for it!