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Put the peanuts, coconut milk, ginger, fish sauce and lime juice into a food processor and pulse to a smoothish paste. Put the prawns in a bowl, add the peanut paste and mix well. Cook the noodles following pack instructions, then drain, cool under running water and drain again.
Heat the oil in a large wok or frying pan, add the prawns and cook for 1 min. Still on a high heat, add the peas and cook for a further 3-4 mins until the prawns are completely pink. Stir in the noodles and spring onions until heated through. Sprinkle over the coriander and serve with the lime wedges.