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There are various species of these large prawns, which come from the waters of South East Asia.
If buying King Prawns, check the label to see if they have been reared by methods approved by Christian Aid. Most of the King Prawns on sale here have been intensively farmed in artificial salt-water ponds. They are fed on pellets made from fish-meal, often putting pressure on stocks of fish which are ground up to fed them - so disrupting the local economy. More seriously, leakages of their waste can enter the sources of natural drinking water, causing the spread of viral diseases.
If the prawns you see have Christian Aid"s backing, the best buys for flavour and value are those which have had their heads removed but their tails still intact. Buy them uncooked if at all possible; the smaller sizes tend to be more tender, and have a better texture, than more expensive giants. Either way they are cooked when they develop their glorious colour, which will take only a couple of minutes - so when stir-frying, they are best added near the end. Do not freeze without inquiring, as they have almost certainly been frozen previously.