"A gorgeous veggie pasta recipe from Jamie Oliver's new book Veg. A vegetarian carbonara recipe with slow-cooked leeks and tasty Parmesan cheese. Happy days!..."
INGREDIENTS
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2 large leeks
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4 cloves of garlic
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4 sprigs of fresh thyme
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1 knob of unsalted butter
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olive oil
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300 g dried spaghetti
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50 g Parmesan or pecorino cheese plus extra to serve
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1 large free-range egg