yes, the best way is I cut from the outside of the prawn and almost right through, say 3/4 through the body of the prawn then slice this slit down the length until half way to the tail, leave the end tail/shell on aswell.
In some indian resturants I have seen them cut all the way through but only 1/4 way down the body, it's funny like that and reminds me of scorpians!!!,,but tasty ones!!