These are wonderful grilled, of course you may season the ground pork to suit your taste, but I find if you are grilling the pork burgers, that they are better mixed with just the bare basics such as salt and pepper, Worcestershire sauce and mustard (if using) as the middle filling has a lot of flavor. I just stated the basics LOL! The filling alone, can be prepared up to a day ahead, also the pork burgers can be stuffed a day ahead, covered an refrigerated until ready to grill. This recipe produces a lot of pork patties (around 12-14) I most always prepare/stuff the patties and freeze half for next time, unless that is, you are feeding a gang of hungry people! I have used half ground pork and half ground beef for this also.