Fresh langoustines need roasting or boiling in well-salted water before being pulled from their shells. They are delicious served with just a squeeze of lemon and a dollop of mayonnaise, garlic butter or aïoli, but can also be added to curry, pasta and paella. Alternatively, deep-fry them in batter, or peel and poach them and make traditional Scampi Provençal. Pre-boiled langoustines should be reheated gently; don't re-cook them or they'll toughen. Alternatively, eat pre-boiled langoustines cold in a salad with a vinegar dressing.