Butternut Squash without elbow back

3 3/4 lbs butternut squash (peeled, seeded, cut into 1 1/2-inch chunks) 1 lb sweet potato 1 lb granny smith apple 2 large onions , chopped 2 tablespoons olive[...]

2 tablespoons unsalted butter 2 tablespoons olive oil 4 cups chopped onions (about 3 large) 2 tablespoons mild curry powder 5 lbs butternut squash (2 large) 1[...]