Slice onion and finely chop the garlic. Heat olive oil in a pan and bring some water to the boil for the pasta. Fry onion for a few minutes and add the garlic.
Cook pasta according to instructions on packet.
Add tuna, peas and tomato puree to onion and warm on a low heat. Drain pasta reserving a small amount of cooking water. Add the pasta to the tuna mix then add lemon juice.
Serve with grated Parmesan.
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