Ajwain, also known as carom, ajowan, omam, omum, ajvain or Bishop’s weed (depending on where in the world we’re talking) is a spice belonging to the Umbelliferae (or Apiaceae) family, some of whose other members are cumin, dill and caraway. The ajwain plant’s shrubs appear feather-like, and the plant itself grows very quickly, reaching up…