Choose fresh young peas, picked the same day and the sweeter the better. Shell the peas just before making the soup and reserve the pods. Cook the peas rapidly in boiling salted water for 4 to 5 minutes and refresh quickly under cold running water (this is called à l’anglaise).
Clean and trim the leeks, chop them coarsely and sweat in 50 g (1¾ oz) butter for 15