How to Butterfly the Meat
Place meat on cutting board. Use sharp knife to cut meat horizontally in half, being careful to not cut through to opposite side of meat. Open meat (like a book), then press with hands to flatten.
Short on time, marinade 4 to 6 hours in refrigerator.
Shred any leftover meat. Mix with additional barbecue sauce, then refrigerate up to 3 days. When ready to serve, cook until heated through. Serve in split sandwich rolls.