My father is a Vegetarian and a frequent traveler.
Due to this it sometimes becomes difficult for him to get a well-balanced diet on flights and airports. Since he travels quite often, he eats anything vegetarian he can find but prefers home cooked food.
As an Indian, home cooked food can sometimes contain curry in the form of Pulses or Lentils or something (adequate source of protein). He prefers this kind of food while waiting on airports during the layover.
Currently he only carries Apples or some other fruit to help him during the flight. Is it possible for him to carry something additional to that in his carry-on as well?
For instance, Curry or other semi-solid food, Egg (he eats egg due to health constraints) or Boiled bottle gourd or anything Semi-solid along with some small quantity of juice.