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On the barbecue, under the grill or over a flame, blacken the peppers all over, then pop into a bowl and cover with cling film. Once cool, peel, deseed and cut into strips, keeping any juices.
Cook the beans in boiling salted water until crunchy but not squeaky, then drain and drop straight into iced water. To serve, toss everything together, adding the shredded basil at the last minute, and scattering with the small basil leaves to finish.