"Bitter herbs" refers to plants or herbs that have a strong, sharp taste which is not sweet, but quite bitter. They are often used in cooking or traditional medicines to add flavor or provide health benefits. Full definition
Another way to help aid digestion is the use of bitter herbs prior meals, to help «prime» the digestive system in preparation for food. (naturopathiccurrents.com)
It is a warm and aromatic yet slightly bitter herb in the mint family. (wellnessmama.com)
Another way to stimulate acid production in the stomach is by taking bitter herbs. (onnit.com)