Cut off the legs, eyes, and the sharp tip of the prawn head
Remove the small black pouch near the tip of the head
Cut along the back of the prawn all the way to the end of the tail
Using a knife, cut slightly deeper along the back — do not cut all the way through
If you see a green strand, it is edible — gently remove only the black vein hidden behind it
Butterfly the prawns so they open up nicely and set aside