court bouillon

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A poaching liquid for fish whose ingredients usually include water, vinegar or wine, diced vegetables, and seasonings.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A seasoned, aromatic liquid, such as a mixture of water with wine or vinegar and spices and vegetables, used for poaching fish, meat, seafood, or vegetables.