For one serving, mix the gin and cucumber juice and top with the tonic water. Peel the cucumber and cut to square off the sides evenly to form a rectangle. Slice into three lengthways and cut into cubes horizontally. Use to garnish the drink.
Place the skinned tail end cuts in a tray. Cover the fish in curing salt. Cure for 1 hour, then rinse thoroughly. Hot smoke the fish in a smoker a