"To make butternut squash easier to handle, cut off the neck, peel it, and cut it into pieces to use in this gratin. Reserve the bottom of the squash, which contains the seed cavity, for roasting...."
INGREDIENTS
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1 tablespoon butter; more for the gratin dish
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1 tablespoon olive oil
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2 large onions, chopped into 1-inch squares (about 4 cups)
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3 tablespoons chopped fresh sage or 1 tablespoon dried
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3 pounds butternut squash, peeled and cut into 1/2-inch cubes (about 8 cups)
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2 cloves garlic, minced
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Salt and freshly ground black pepper to taste
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1/2 cup plus 2 tablespoons heavy cream, heated until warm