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Remove the skin from the roasted garlic cloves. In the small bowl of a food processor, whizz the roasted peppers, garlic, cayenne, almonds, Parmesan and oil until it makes a rough pesto consistency. Taste and season.
Bring a pan of water to the boil and cook the pasta following pack instructions. Drain, reserving a little cooking water. Return the pasta to the pan with the pesto, basil and a little of the cooking water, then heat through. Serve with extra Parmesan, if you like.