Advance Tailgating Preparation:
Prepare burger mixture and shape into patties as above. Prepare slaw. Store each separately in an airtight container in the refrigerator for up to 24 hours.
For a charcoal grill:
Grill patties on the rack of an uncovered grill directly over medium coals for 14 to 18 minutes or till meat is done (160 degrees F), turning once halfway through grilling. (For a gas grill: Preheat grill. Reduce heat to medium. Place patties on grill rack over heat. Cover and grill as above.)
Before leaving home, place containers inside a well-insulated cooler with plenty of ice or ice packs (keep at a temperature of 40 degrees F or below). Wrap pita bread halves in foil. At tailgating site, grill burgers as above. Add wrapped pita bred halves to grill the last few minutes of grilling to heat through, turning occasionally. Serve as above.