Vegetable bouillon was a soup made from various vegetables. It was a clear liquid with a golden color.
In 2371, Captain Kathryn Janeway ordered a vegetable bouillon from a replicator while having a talk with Kes. (VOY: "Eye of the Needle")
In 2372, Captain Janeway again ordered a vegetable bouillon, but canceled that for coffee ice cream. (VOY: "Persistence of Vision")