Tataki of Tuna

The Japanese, for whom the freshest fish is central to their diet, often eat tuna raw as sashimi. Getting hold of tuna fresh enough to be eaten uncooked is difficult in Britain, while for those who have not tried it, the idea of raw fish often seems quite alien and unpleasant. Absolute freshness is of paramount importance, of course, as tuna deteriorates rapidly once it is butchered.

When you buy it, take it home in a cool-bag and, as soon as you can, trim the fillet of any b