A stew was a kind of hot food dish, similar to a soup, which could be made with a variety of ingredients.
Stewed jellyfish was one of the items on the menu of a dinner that the Chinese delegate to the World Peace Conference, Fu Peng, offered to the Third Doctor. Though the Doctor seemed to relish the thought, the Brig's face betrayed his lack of enthusiasm. (TV: The Mind of Evil)
Bouillabaisse was a fish stew. The Fourth Doctor suggested that he and Romana II eat some when they were in Paris. (TV: City of Death)
The Seventh Doctor and Paterson once talked about a "worm stew". (TV: Survival)
Megeshra stew was a Peladonian stew made from vegetables. Arla Decanto had a recipe which she taught to each of her apprentices, and the Eighth Doctor once cooked his own for lunch. (AUDIO: The Truth of Peladon)
According to the Tenth Doctor, Alfred the Great used to serve his guests a venison stew that was "all right". (PROSE: Revenge of the Judoon)
John Riddell ate stew with the Eleventh Doctor. (TV: Dinosaurs on a Spaceship)