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Cook pasta according to packet directions. Drain.
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Heat oil in saucepan. Add walnuts, stir constantly over high heat until light brown.
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Reduce heat, add onion and garlic cook 3-4 minutes until transparent.
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Add spinach and tuna liquid, cover, cook until spinach just wilts.
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Flake the tuna. Gently toss pasta into spinach mixture with tuna.
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Add lemon rind, juice and salt and pepper to taste.