Epazote is common to Mexican cooking. While fresh epazote should be your first choice, it is often difficult to find. When substituting our dried herb, use one-half the amount specified for fresh leaves. Epazote is most commonly found in bean dishes. It is also used in soups and moles.
Epazote has a slightly tangy flavor, reminiscent of oregano. It's used both for flavor and for it's ability to reduce the flatulence associates with bean dishes.