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Pronounce it: tune-ah
A member of the mackerel family, tuna are mainly found in the world's warmer oceans. They can grow to a huge size (up to 700kg) and their meaty flesh is distinctively flaky and firm with a rich, strong flavour, the consequence of its comparatively high oil content. Tuna is mainly sold as steaks. It dries out quite quickly, so should be cooked very briefly over a high heat; marinated before cooking; or simmered in a sauce.
There are many different varieties of tuna but, largely as a consequence of prolonged overfishing, only a handful of these are commercially available - and most of those that are available are considered to be endangered to the point of extinction (Mediterranean and Atlantic) or in decline, particularly bluefin.