Most characters in Genshin seem to have a specialty dish -- produced when using a normal base recipe, the character has a chance to produce their special version of the dish. For example, if you use Amber to cook Steak, you have a chance to produce the dish "Outrider Champion's Steak".
I've seen a list here showing most of the characters' custom dishes. But it doesn't list Qiqi's custom dish. That gets me wondering -- does she have a custom dish, or does it not exist at all? It would be at odds with the game saying that every character has a custom dish.