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Onions are a shallow-rooted, biennial monocot. They have multiple layers of thick, dark, papery skin. Storage onions have a higher percentage of solids than non-storage varieties and they are usually rich in sulphur containing compounds, which gives them a characteristic pungent odor. Both the growing and storage environments can affect onions pungency which tends to increase with higher temperatures and longer storage. onion seeds or known as Nigella sativain English, and it is a yearly blossoming plant that is local to South and South-West Asia. The dark seeds or Kalonji seeds are obtained from the dark fruits that contain various seeds.