Angostura
The famous angostura is one of the noblest bitterness used to flavor vodka, liqueurs, cocktails, and soft drinks. In very small amounts, it is an interesting seasoning for some meat dishes (e.g.. pate), soups, sauces, and even vegetable and fruit salads.
The angostura recipe is – from 1824 year - a closely guarded company secret (extract of various aromatic herbs). Admittedly, he is a great cocktail expert, Franz J. Muller, keeps, that one of the ingredients of angostura is the bark extract of the tree with that name, However, this is categorically contradicted by the information on the labels that seal the bottles tightly. So how is it really, only the producer knows.