It is important to rinse the fresh pipis, before cooking, as the water in the bag is very salty.
Frozen pipis cook in a very similar time frame to the fresh pipis when barbequing, steaming and poaching. They do take a little longer in the oven.
To prevent overcooking it is best to remove the open shells and set them aside, especially on the barbecue.
Any shells that do not open can be prised open or cooked further until they open.