Cook the bacon under a hot grill until crisp. Allow to cool a little then crumbled into small pieces. Grate (shred) the Havarti (if you have difficulty getting Havarti cheese, any full-fat, semi-hard cows milk cheese - like Stilton, Fontina, Gouda, Provolone - will work). Finely chop the parsley. Place the bacon, cheese and parsley in a bowl and mix to combine.
Place the minced (ground) turkey in a separate mixing bowl. Add the Worcestershire sauce, a couple of pinches of salt and a few twists of freshly ground black pepper. Mix gently until the Worcestershire has been worked in (try not to over mix the meat).
Separate the seasoned meat into six equal portions. Flatten each portion and shape into a circular patty. Press into the centre of the patty with your thumb to form an indent. Place one sixth of the cheese/bacon mixture into the dip in the meat of each burger then work the edges around the stuffing up and over until the stuffing is completely encased in turkey.
Shape the meat to create a flattened patty, avoiding a meatball shape. Season the outside of the stuffed burgers lightly with salt and freshly-ground pepper. Grill (braise) the burgers under a medium hot grill for about 4-5 minutes per side or until the meat is just cooked through. Allow the burgers to rest for a couple minutes before eating. Serve hot in a bun with your choice of fillings (what about Red Cabbage with Apples?)