Ajwain seeds, also known as bishop's weed, is an uncommon spice that's found in certain areas of Asia. 

These tiny fruit pods is aromatic, has a slightly bitter and pungent taste, similar to thyme, only stronger. A tiny amount of raw ajwain seeds will over powder the flavor of a dish. 

In Indian cuisines, ajwain seeds are used wither dry roasted or friend in ghee or oil, which has a subtle aroma. These seeds are also commonly used for parathas, roti, and namkeen.