Spring is the best time for those tender little peas and beans, and langoustine tails complement them beautifully, not to mention producing the perfect colour contrast.
Bring to the boil a pan of water large enough to fit the langoustines. Stir in a good tablespoon of salt, then plunge in the langoustines, bring back to the boil and simmer for 3 minutes. Drain in a colander and leave to cool for 6-7 minutes.
Remove the heads and shells and put the tails in the fridge. Wash the shells in cold water and put them into a saucepan wit