Instructions
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Cook the pasta in a slightly salted water for 7-8 min. Drain and add butter or 1-2 tbs. olive oil (optional).
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In the meantime heat the olive oil over a medium-low heat.
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Add the pesto, the onion and a pinch of salt and pepper.
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Fry for 5 min (until the onion softens).
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In a large bowl add the mixture to the spaghetti and sprinkle with the parmesan. If you wish, you could add some basil leaves on top.
