I know the translation is Welsh onion, but that doesn't really mean anything to me. From an American/European supermarket standpoint, are they closer to scallions/green onions, or leeks? My local Korean supermarket has 3 such items - regular scallions, big western style leeks, and then something that looks like a cross between the two, like a very slender, very long leek, or a fat, long scallion. No idea what they call it in Korean, but does that sound like negi? Also, are negi used instead o