alliaceae allium aromatic beneficial bulb circular condiment cooking culinary cultivar cut edible flavonoids flavor flavoring flavour flavouring food fragrant fresh healthy layers medicinal mild moist nutritious odor odour onion pungent purple purple-onion raw red red-onion rings round salad-vegetable skins soup-vegetable Spanish-onion stir-fry-vegetable tangy tasty textures vegetable vegetables circles garden onions health onions purple onion Red onion salad vegetable soup vegetable Spanish onion stir fry vegetable veg