2 tablespoons unsalted butter
2 tablespoons good olive oil
4 cups chopped yellow onions (3 large)
2 tablespoons mild curry powder
5 pounds butternut squash (2 large)
1 1/2 pounds sweet apples, such as McIntosh (4 apples)
2 teaspoons kosher salt
1/2 teaspoon freshly ground black pepper
2 cups water
2 cups good apple cider or juice