What is Finnish Juice? Not familiar with that.
But honestly though, I have no idea what is Finnish juice. I was gonna say lingonberry juice but apparently you can find that abroads too... (Also: not a fave.)
I would say Finnish juice is any juice made in Finnland.
We have a laugh about the Brits who take their food abroad. They take spaghetti to Italy.
But what about the Finnish juice? You don't put the artcle there and neither. would I.