It's possible you're thinking of something else! Maybe you're thinking of:
* Neptune seafood: Neptune is often associated with the sea, so you might see "Neptune" used in the names of seafood restaurants or dishes.
* Neptune-themed desserts: A creative baker might make a blue dessert with swirls, like a blue cake or cookies, and call it a "Neptune" dessert.
* "Neptune's..." in a recipe name: If you remember the exact phrase, I might be able to help you further.
Can you tell me more about the context where you encountered this term? That might help me figure out what you're looking for!