Rigatoni al Tonno

1 lb Rigatoni
2 ea Onion
2 Tbsp Margarine
1 can Tuna Crushed
1 can Heavy Cream
1 cup Parmesan Grated

Cook rigatoni al dente. Meanwhile, chop onions and fry in margarine. Add crushed tuna and cream. Mix in rigatoni. Serve with grated parmesan cheese. 

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