The small grey shrimp are a real delicacy and also referred to as Caviar of the North Sea or Grey Gold. In Dutch they are called garnalen, in French crevettes.
It is incredibly time consuming to peel them but still today families gather around the table and engage in the art of peeling in the same way as others do puzzels or play games.
This man in front of Den Huzaar, a restaurant in Bruges, certainly seems to enjoy the job and explained the importance of using the hands to peel them (as opposed to shrimp mechanically peeled somewhere abroad and shipped back to Belgium). There are fresh as they can be, contain no additives -- they are 100% natural shrimp.