Add frozen spot prawns to a large bowl and fill with cold (not warm or hot) water. Let the prawns thaw for about 15 minutes. Optionally, drain the water to stop the shrimp from continuing to quick thaw.Tip: If the prawns have roe, it will be easiest to remove while the prawns are still partially frozen.
Using kitchen shears (scissors), cut the prawn from head to tail along the upper, rounded portion of the shell.
Use your fingers to peel both sides of the shell back away from the meat.If you notice a dark vein on the shrimp (the digestive tract), you should be able to easily remove it at this point by using the tip of the scissors or a small paring knife. (Deveining the shrimp is optional.)
Gently remove the prawn meat, taking care not to accidentally tear off part of the tail.Store the shrimp meat in the fridge until you're ready to use. Use within 1 day.
If the prawns have roe attached, flip the shell over. You can now separate the roe from the shell. Refrigerate the roe until ready to use and use within 1 day. Store the shells in the freezer and use to make stock when you're ready.Alternatively, leave the roe in the shell and place both in a freezer bag to make stock later.