Actually it wants you to have currants, the item, not just currants as in the game's currency. I've filed a bug to change the name of the item so that it's not as easily confused with in-game money. I looked in your player file and didn't see any currant items so I'm going to assume you didn't have some and then threw them out; if you actually had the currant items and it wasn't registering, let me know and I'll take a look at that.
There are a few ingredients needed to cook unlocked recipes that appear to be unavailable in the game so far. Besides currants-the-item, there's also "gas," which from its /items listing looks like it's supposed to be the same thing as general vapour, and then of course there's the mysterious, mythical Mangosteen!