1. Herbert Samuel Herzliya — The Ritz-Carlton, HaShunit Street, Herzliya Marina
The best cooking in the city, in the Ritz-Carlton on the marina, and kosher.
Herbert Samuel is the kitchen on the ground floor of the Ritz-Carlton, and it is the clearest answer to the question of where the best food in Herzliya is. It is also kosher, which in a restaurant at this level in Israel is rarer than it sounds.
The cooking is modern Mediterranean built on grilled meat and fish, served in a dining room that looks out over the marina. It is the restaurant the business district uses for the meal that matters, which means it is at its busiest and best on a weekday evening.
It is expensive, and it does not pretend otherwise. For a special occasion, or for an observant visitor who has run out of serious kosher options on this coast, it is worth it.
Good to know: Being inside the hotel, it keeps hotel hours around Shabbat and the festivals — check before you build an evening around it.