When i still actively used Chucklefish forums, i mentioned i'd like at least a dish that requires sweet gem berry, it could be a big buff, as it's not that common, and its duration would be longer, and if i were to say what it'd give, it'd be the basics of combat, which are attack, defense and mining +3, maybe +1 speed, too.
I just thought about ancient fruit, too, which is less rare, since you can infinitely get those in the greenhouse, as they just keep giving.
At least a few dishes of these, like maybe also one that goes outside of mining with farming, foraging and fishing +3 would be great!
Or just one of them and +1 luck, as luck plays a big role in this game.
Then i'd LOVE to use more stuff that are no ingredients yet, as we have parsnips, potatoes and such, but many others not!
Plus more fish to use in cookings would be cool, adn gives us reason to catch them more, especially cheap ones, as they are not as useful, aside from quality fertilizer and "any fish" cookings.