We have often looked in amazement at sea urchins when we have been buying our seafood and our local shop owner showed us how to open and eat them and then gave us some to try. You take a pair of scissors and cut around the top and take it off. Inside, it is practically empty apart from some black liquid that you rinse out and you are left with segments of orange roe that you eat on bread. It is ok but we thought that they were not worth the effort and won't be buying any. We'll stick to mussels instead.