Mexican oregano is a dried herb used in Mexican cuisine. It’s similar in appearance to regular, Mediterranean oregano but is, despite its name, a cousin of lemon verbena rather than a member of the origanum family to which oregano belongs. It shares some of oregano’s unique and pungent earthy flavors and aromas but more subtly so with an added grassy kick of citrus and licorice. Mexican oregano is readily and cheaply available online and adds a unique element to Mexican dishes. If you can’t get Mexican oregano, you can substitute a pinch of marjoram or even regular oregano, just use a little less than the recipe dictates.