Which vegetable is the soup made from?

Please provide me with more context! I need to know what soup you're talking about in order to tell you which vegetable it's made from. For example, tell me:

* The name of the soup: "What vegetable is in tomato soup?"

* A description of the soup: "What vegetable is the creamy, green soup made from?"

Once you give me more information, I can tell you the vegetable!