Stuffing may be prepared a day in advance and saved for later use in stuffing peppers. Preparing the stuffing early makes it easier to manage the grill, especially if the chef will be working outdoors on the grill and preparing the stuffing mixture indoors. Do take the stuffing mixture out of the refrigerator about 20 minutes before adding it to the peppers. Otherwise, the peppers may overcook while the stuffing comes to serving temperature.