Discard the bottom end of the main stem of the samphire if it is too woody. Fresh samphire (also sold as sea beans or sea asparagus) is available in some grocery stores and fish markets. Alternatively, bottled marinated samphire, also available online and in some stores, can replace pickled samphire in this recipe.
Eco-friendly tip: Thanks to soil-friendly calcium carbonate, oyster shells make excellent compost! Simply give them a good wash, break them up and add them to your garden.