Butternut Squash Gratin with bacon

1 (2 -3 lb) butternut squash 2 tablespoons unsalted butter 3 cups halved and sliced onions salt 1/4 teaspoon black pepper 3 cups peeled peeled cored sliced[...]

1 butternut squash (approximately 2lb) 1 tablespoon butter 1 onion , thinly sliced (sweet is best) 2 tablespoons flour 1/4 teaspoon pepper 1 cup chicken broth[...]