Cut the beef diagonally into thin strips about 1" wide. Thread onto 16 skewers, (if using a bamboo skewer soak it in water for 30 minutes before use) allowing 1 to 2 ribbons of beef per skewer. In a small bowl, combine the barbecue sauce, shallots, lemon juice, lemon peel, garlic and pepper. Brush skewered beef generously with sauce mixture. Place over hot coals in covered grill. Grill 2 to 3 minutes on each side.