"If you can't find pappardelle pasta, James suggests substituting fresh spaghetti or angel hair...."
INGREDIENTS
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2 medium-size yellow squash (about 1 lb.), divided
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2 medium zucchini (about 1 lb.), divided
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2 medium carrots, divided
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1 small onion, chopped
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1 garlic clove, minced
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3/4 cup vegetable broth, divided
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5 tablespoons olive oil, divided
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1 teaspoon salt, divided
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1/2 cup chopped fresh basil, divided
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1 (4-oz.) package prosciutto, torn into strips
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2 (8.8-oz.) packages pappardelle pasta
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1 tablespoon butter
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3 green onions, chopped
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1/2 (8-oz.) container mascarpone cheese
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3/4 cup freshly grated Parmesan cheese