While it may be referred to by many names, there is but one sought after goal after cracking the shell. The “roe” or glands are the only  goods taken from the urchin. There are five in each urchin and these amount to a few ounces of goodness.

Yes. While raw urchin ‘roe’ is served and added to many dishes, it is often preferred to be eaten immediately after they have been cut open.