Ever since Sergio Leone talked Clint Eastwood into wearing a poncho for A Fistful of Dollars and invented the Spaghetti Western, filmmakers have been enthusiastically re-mixing the iconography of the American Frontier. In Mads Mikkelsen’s gritty, gripping Danish period drama The Promised Land, those cliches receive a cosy Scandi upgrade. Cancel the spaghetti: behold the Hygge Western.