Not formally, at least I think it's posted outside the dining room at dinner. But you can just ask the head-waiter when to look for a particular item. I haven't eaten lunch much indoors, mostly in the Grill, which is indoor/outdoor. So don't know the other lunch menu that well. Mostly buffets, in both locations, but varying every day.

Wendy
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Booked: Uniworld Egypt, 2015
Tauck Amsterdam to Budapest, 2016
Paul Gauguin, Societies & Tuamotus 2016