Why would anyone want to boil prawns?
Out of the cold pack from the store cooler these tasty critters are hardy and colorful. Cooking can and will take away the color and the meat will not hold up as well.
Just use um as ya get um, sometimes it is better to shell them as they tend to fall off in fast water, but meat holds hooks real good.

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elmtree (woody)
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elmtree (woody)