If you go back through older Watch posts, there's a list out there of places that don't have any aphrodisiacs in their food or at least label them well.

[Said with no idea he's basically telling a 1920s guy to search a forum.]

Look for "The Bliss-Soaked Emissary of this Night's Pleasure Eternal."

[While he has a good memory, he hasn't memorized every single post he's ever seen. It's just a username that sticks with you.]