CNN  —  Anthony Bourdain loved haggis. But even the late, great American chef, writer and television host recognized that Scotland’s national dish, with its “sinister sheep parts” wrapped in a shroud of mystery and half-invented history, could be a hard sell. “Don’t let them tell you otherwise, that’s really one of life’s great pleasures,” Bourdain said on one of his gastro-curious pilgrimages to Glasgow. “There is no more unfairly reviled food on Earth than the haggis.” A mash-up of diced lung, liver and heart mixed with oatmeal, beef suet, onion and assorted spices, haggis was traditionally made by stuffing these raw ingredients into the stomach of a recently slain sheep and boiling the lot to a state of palatability. Instagrammable is not the word that immediately comes to mind. In our 21st-century world, where “clean” eating and processed pap overlap, haggis can seem like an “Outlander”-style outlier from another age. Yet, by some alchemy, once cooked to its required “warm-reekin’ (steaming)” state, it adds up to much more than the sum of its modest parts. …