Its always struck me as odd how cooking felt like one of the few tasks/professions which has very few curios linked to the normal process of doing. To that end, I think itd be neat if, whilst preparing food, you could end up creating curios, much like how when you scavenge you can find curios naturally.
One idea was a "Baker's Dozenth", a small extra ball of dough made whilst preparing dough (most likely for bread?), either studied raw, or maybe bake-able? Something similar for an 'extra pancake' could also be pretty cool.
Another could be a "Double Yolk". Im not sure how to best implement this, but with the game's usual vibe towards curiosities, I could see a double yolk egg being a neat one.