Every starport class C and above is going to have at least some offering that represent the local cuisine for the people who actually work at the spaceports; there may even be places that represent the cuisines of nearby systems. Whether this is the equivalent of a sit-down restaurant, fast-casual, fast food, or street-food may vary.
Any Imperial spaceport is likely to have Vilani cuisine at at least one Solomani cuisine represented. There may be inability to get certain ingredients to a world cheaply so there may be a local variant. Consider the countries that used to be part of the Ottoman Empire: There are certain dishes that are common to all of them, but might be slightly different because of either what ingredients are locally sourced, or because different religious communities don't eat specific things or specific combinations.
Most sizable starport eateries in, say, the Spinward Marches are likely to have at least one place that serves Darrian or Sword Worlds food too, and very likely something that appeals to Vargr travellers.