Which is the king of vegetables in the world?

Could you elaborate on the concept of a "king of vegetables" in the world? Are you referring to a specific type of vegetable that is widely considered to be the most important, nutritious, or popular globally? If so, which factors do we take into consideration when determining this title? Is it based on cultural significance, nutritional value, or some other metric? Additionally, is there a universally agreed-upon answer to this question, or does it vary depending on regional preferences and diets?