How do you farm a geoduck?

It's not the most beautiful dinner to look at and it has a very odd name... but in China the geoduck is an expensive delicacy, so on North America's Pacific coast the race is on to farm them and cash in.

Its long, probing siphon bulges out of its shell and burrows through the sand - sucking in sea water, and squirting it out again (minus vital nutrients) from its tip.

Even its name sounds peculiar when pronounced correctly: "gooey-duck".

The BBC's David Botti went to Washington state to document how geoduck is farmed in a process that takes about six years.

Read more about geoduck here.