Cut squash in half vertically {for scalloped edges} or horizontally {for larger cavity}. Scoop out seeds.
Cut a very thin slice off the bottoms of each squash half so it will be stable.
Place squash cut side down in a roasting pan and fill with 1/2 inch water. Roast squash at 400 degrees for 30 minutes.
Core apple and chop into small pieces {it isn’t necessary to peel the apple}. Squeeze lime juice over all.
Wash blueberries and check for stems
After 30 minutes remove squash halves from oven and drain water from pan. Turn squash over and brush generously with butter.
Fill with blueberries and apple pieces. Slowly pour syrup over fruit, letting it puddle in the bottom of the cavities. Return to oven for 30 more minutes.
Garnish with bacon, candied walnuts and bleu cheese crumbles and return to oven for a few minutes to melt cheese.