There are two types of samphire: rock samphire, which originates from the Mediterranean, and marsh samphire. Both are harvested in the summer months. They have a firm texture and a pleasantly salty tang, which makes them the ideal foil for fish and seafood dishes. If you're lucky enough to live near the sea, you can forage for it yourself; otherwise a good fish dealer (or even some supermarkets) is your best bet. Try samphire in these dishes...