Remove the prawn head by holding the prawn by the body with one hand and then firmly grasp the prawn's head with your other hand.  Peel off the shell and then peel off the remainder of the prawn's outer layer. Pull the legs off using your fingers, from its underside. Then pull off the tail, firmly holding the body of the prawn with one hand and grabbing the prawn tail with your other hand. Devein the prawn with the help of a sharp small knife. Cut a small line that runs down the length of the prawn's back and use the tip of the knife to pull out the vein. You can also watch the short video attached to the recipe card to show how to peel and devein raw prawns. Once you have your prawns shelled and deveined, you can keep them in the freezer for up to three months to use later in delicious recipes such as Chorizo and Prawn Pasta.