Herring with juniper? Never had it that way, but it sounds awesome! I do enjoy juniper beers & I love herring. I've been to Holland twice, once to Amsterdam & once to Rotterdam; but I don't remember seeing any street vendors selling herring. I certainly would've tried it. Maybe I did see them & thought they were hot dog carts. If I ever make it back there again, I'll have a mission to find one & try their salt herring. I like the pickled in wine sauce the best, but it's all good: fresh, smoked, pickled in wine sauce, cream sauce, spiced, canned, roll mops, fried, though I haven't tried surstomming yet, I'd certainly try it. I might not like it, but I'd give it a shot.
Regards, GF.