INGREDIENTS
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extra-virgin olive oil
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2x1/2x1/2-inch sticks peeled assorted root vegetables (such as parsnips, carrots, celery root, and golden beets)
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large garlic cloves, peeled
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celery stalks, cut crosswise into 1/2-inch-wide pieces, plus 6 tablespoons chopped celery leaves, divided
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penne rigate or whole grain penne
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finely grated Parmesan cheese
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finely grated lemon peel
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(scant) ground nutmeg