Preheat the oven to 375℉. Cut the zucchini in half lengthwise. Scoop out the centers leaving a ¼ inch shell. Pour the zucchini centers in a medium mixing bowl.
Chop up the zucchini shells into ½ inch cubes. Place the chopped zucchini into a dutch oven. Set aside.
Using a spoon, coarsely chop the zucchini centers. Add the ground beef, mayonnaise, onion flakes, parsley, oregano, salt, pepper, lemon juice, and Worcestershire sauce. Gently mix into the meat using your hands. Do not over mix!
Evenly cover the chopped zucchini with the ground beef mix. Top with spaghetti sauce. Cover the dutch oven and bake for 30 minutes.
Remove from the oven and chop up the beef into bite sized pieces with a spoon. Pour in the white wine, chicken stock, and bay leaves. Cover, and return to the oven. Bake another 20 minutes.
To serve, ladle into bowls and top with grated mozzarella cheese or Parmesan and a sprinkle of fresh parsley. Pair with some toasty sourdough bread! Enjoy!