A bitter or bittersweet liquid used to flavor cocktails, apéritifs, and foods. It is distilled from aromatic herbs, barks, roots, and other parts of plants. It has a high alcohol content. The most renowned of any bitters is Angostura bitters, first created by Dr. Johann Gottlieb Benjamin Siegert in Venezuela in 1824. It is made by combining an infusion of herbs and gentian root with a strong rum base. It was originally used as a medicine for some illnesses as well as seasickness, but today it is used primarily to flavor beverages and cooked dishes.
Due to the presence of many herbs, spices, and high alcohol content, bitters will keep for a long time once opened. Store in a cool, dry place, and make sure to properly seal the bottle.