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Peel garlic and process in a food processor with a little salt and pine nuts until broken up. Add basil leaves and continue mixing to a paste.
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Gradually add olive oil, little by little, until the mixture is creamy and thick. Sometimes I even add LESS oil if I'm feeling more health conscious :).
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Beat in the butter and season with black pepper. Beat in the cheese.
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Cook pasta in boiling salted water, according to package directions, until al dente. Drain well.
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Toss the pasta with half the pesto and serve in warm bowls, with remaining pesto sauce spooned over the top.
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You can also store the pesto sauce in a jar, with a layer of olive oil on top, in the fridge.