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Heat the oil and garlic in a large pot. Add pancetta, celery, thyme and mushrooms, then cook on medium heat for 4 to 5 minutes, stirring occasionally.
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Mix the tomato paste into the pot and cook for 1 minute.
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Add lentils, tomato passata and stock, then bring to the boil. Once boiled, reduce heat to a simmer.
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Next add the pasta to the pot and cook for 8 to 10 minutes, or until pasta is al dente.
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Remove the pot from the heat and cover for 2 minutes. Remove the garlic and thyme, then tear the basil leaves into the pot.
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Add salt & pepper to taste.
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Finish with pecorino over the top of the soup.