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2 cups uncooked whole-wheat farfalle (bow tie pasta)
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2 cans (6 ounces each) unsalted white tuna packed in water, drained
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1/4 cup onions, finely chopped
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2/3 cup frozen peas, thawed
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2/3 cup reduced-fat salad dressing
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1/8 teaspoon ground black pepper, if desired
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4 cups fresh spinach