As its name might suggest, Mediterranean Treasure is inspired by the flavours that surround Barcelona. It is a sour/savoury cocktail that blends flavours of both land and sea. The full-bodied Tanqueray No. Ten with its fresh citrus fruits and botanicals is muddled with coriander in the preparation of the cocktail. Furthermore, Oyster leaf (a member of the borage family, also known as sea bluebell, with a taste that resembles that of the shellfish) is infused in Fino sherry to give saltiness and a distinctly Spanish tang to the recipe. If you really want to go for maximum maritime, it can be served in a seashell and enjoyed with fresh seafood.