“There are only two kinds of people in the world,” an Irish saying goes. “The Irish and those who wish they were.” If you look around on St. Patrick’s day, you might think that’s true, for on St. Patrick’s Day Americans, regardless of their ancestry, will wear green, sing Irish songs, guzzle Irish beer, and dine on corned beef and cabbage. But not in Ireland. There you’d be lucky to find more than a handful of packages of corned beef in any of the local supermarkets. That’s because, contrary to