Headcanon that because there’s fanfiction about famous chefs, there’s probably fanfiction about Carmen Berzatto in The Bear universe and Syd accidentally stumbled upon it at some point while looking up something about Carmy and read it. She went down a rabbit hole of Carmen Berzatto fanfic and now she has the embarrassing secret that she’s read multiple Carmy fanfics and now they own/run a restaurant together