We had dinner here at Al Fassia in the new town, to compare it with the dinner we had in a traditional riad the night before (see review for Dar Zellij). The decor and ambience here is more modern but the food and service are both traditional - which is to say, warm and copious. The joy of this place is that you can order a la carte and the menu offered is what I imagine is the essense of Moroccan cooking.
There is a choice of four starters, and we tried three (harrira, briouat and pastilla) and all were extremely delicious. There is a really good choice of main courses and many variations on the lamb / chicken tagine or cous cous theme. Whatever kind of tagine or cous cous you like, you should find it here. The only word of caution is that there is only one choice for vegetarians.
Service was welcoming and efficient. We asked the children if they noticed what the difference was between the two restaurants (Dar Zellij and Al Fassia) and they rightly pointed out the different interiors, but did not notice that one was staffed entirely by men and the other entirely by women.
If you are staying in the old town, it is definitely worth making the trip out here to have a meal. For me, it restored my faith in Moroccan cooking, after viewing so many half hearted menus in the medina restaurants.
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