No, this isn't necessary with this dish. Recipes that call for the pork to be boiled first, tend to be for the tougher or fattier cuts of pork like pork shoulder and pork belly. Boiling the pork helps to tenderise, and also removes excess fat. Because this recipe is made with pork leg steaks there is a low percentage of fat, and the meat itself is tender enough to be fried without being boiled first..