What's the best/easiest way to de-vein king prawns? I often buy raw king prawns (maybe they're called shrimp where you are, they're about 3-4 inches long) - they are already shelled and beheaded, but they've still got the blue vein running down the middle of them. My current technique is to put the point of a sharp knife just under parts of the vein and then pull it out, kind of like unpicking a thread of cotton. This takes quite a while, there must be a better way..? Is butterflying a way to achieve this?
Have you tried the basic cheapo shrimp deveiner? A little practice, and it's actually quite effective.