Dutch Creams, Bone Marrow, Air-Dried Tuna and Coffee

• 4 dutch cream (waxy) potatoes, scrubbed clean
• 50 g (1¾ oz) butter

Make a cure for the tuna by combining the salt, sugar and lemon zest in a small bowl. Rub the mixture vigorously into the fish and set aside to cure for 45 minutes. Wipe the cure from the tuna.

To smoke the tuna, line the base of a large, heavy-based saucepan with the hickory wood chips. Ignite them until you see them start to smoke then place the lid on top to capture the smoke. Workin