Before 1997, Oreos were made with lard, and my family was sufficiently kosher that that meant we were a Hydrox family. I haven't had a Hydrox in at least fifteen, maybe twenty years, and that is perhaps why the cookie went off the market. Hydrox came four years before Oreos: the knock-off was what succeeded and surpassed the original. I suppose Hydrox have actually been off the market since 1996, when Keebler bought Sunshine and changed the recipe.