"In this luxurious risotto, leeks take the place of the chopped onions that are traditionally used in the beloved Italian rice dish...."
INGREDIENTS
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3 tablespoons olive oil, divided
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4 cups 1/2-inch cubes peeled butternut squash (from 21/4 pounds squash)
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3 cups 1/2-inch-wide slices leeks (white and pale green parts only)
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1 tablespoon chopped fresh thyme
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2 cups arborio rice
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4 14-ounce cans (or more) vegetable broth
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1 cup chopped fresh basil
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3/4 cup freshly grated Parmesan cheese plus additional (for serving)