Prepare blueberry barbecue sauce my mixing together ingredients in a small microwave-safe bowl. Set aside.
Preheat gas or charcoal grill to approximately 400° degrees while preparing patties.In medium bowl, gently mix together ground beef with Worcestershire sauce, garlic, red onion and parsley. Season with salt and pepper, if desired.
Divide mixture into 8 portions of 2-ounces each. Form 8 patties in repurposed lid or with hands. Use thumb to make a shallow indention in the middle of each patty.Place burgers on grates and grill, with lid up, for 3 to 5 minutes or until “meat sweat” starts forming on top. Flip burgers once and continue to grill for 3 or 4 more minutes or until internal temperature reaches 160° when measured with an instant-read meat thermometer.While still on the grates, but heat off, brush tops of burgers with blueberry barbecue sauce. Remove burgers to platter and let rest for 5 minutes.Place burger on bottom of roll (with sauce side up) and top with approximately ½ ounce blue cheese, spring lettuce mix, and pickled red onions, if desired.