If you’re looking for Irish Soda Bread—the slightly sweet scone-like raisin bread that is as much a part of St. Patrick’s Day as green beer—sorry, this isn’t it. This recipephany is for authentic Irish Brown Bread, the hearty whole-grain soda bread served on cutting boards alongside a crock of butter or ragged slices of cheddar. Well, at least at Matt Murphy’s Pub. Everyone in Ireland makes Irish Brown Bread. It’s a kind of national institution. I wish I could say I brought this recipe back from our trip there a couple of years ago. I had made it my mission to track down the best recipe. One woman rattled off the recipe from her…