This is such a great dish - you must try it!  In Morocco we probably had it at least five times.  My first tagine instructor was the lovely Fatna, who helps our friend Maggie in Tangiers.  Fatna likes to keep the olives separate and use them as a garnish, having cooked them with minced garlic, preserved lemon, parsley and coriander (cilantro).  I have simplified; one of the wonderful things about most tagines is that you can put everything in together at the start and then leave it to work its magic largely undisturbed.  It couldn’t be easier.