Unlike many places in the United States where kashrut certificates are granted entirely on the basis of the foods prepared and served, with very rare expcetions (a few restaurants in the Galilee), kosher restaurants in Israel are not even allowed to open their doors on the sabbath. In fact, they are required to close their doors a minimum of one hour before the onset of the sabbath and then to re-open only after the sabbath is officially open.
Because of the needs of visiting tourists staying at hotels who cannot prepare meals at home, hotels are allowed to serve meals on the sabbath but all of the food must be prepared before the onset of the sabbath. With this in mind, breakfast and lunch are served on Saturdays but those are mostly of cold buffets and, if the truth be told, there is not a single kosher hotel that offers food of a quality high enough to attract me on the sabbath. I suppose if I did have to dine in one of those restaurants I would stick rather carefully to the hard boiled eggs.