Winnyace, the lemon mentioned is going to be provided unprocessed along with materials to keep it fresh. Having the product remain fresh is crucial for maintaining its high bargaining rate. Afterall, a processed product does have an expiration date. So the lemon need not be processed like the decapitated fish you sell.
I've taken a look of what this "shady meat" of "damaged and mutated bodies" Katou claims to be. It looks like a failed experiment of some lab. Some intact contents show shades of hair that are a few hex numbers off the originals, and the meat contents is a bit lower in myoglobin content overall. The meat seems consumable, so I see no issue there.