alliaceae allium allium cepa brown onions bulbs circles common onions cultivars cut edible flavonoids flavor flavour food green growing growth half halved healthy layers leaves lines medicinal mild nutritious odor odour onion oval-shaped paper thin papery skin peel peeling pungent raw round salad vegetable shooting shoots skins soup vegetable stir fry vegetable tangy tasty thin vegetable white aromatic beneficial bulb condiment cooking culinary cultivar flavoring flavouring fragrant fresh garden onions health moist onions purple purple onion red Red onion rings Spanish onion textures veg vegetables aggregatum allium-cepa brown cloves clusters cross-cut cross-section delicate-piquancy eschallots French-shallots gourmet gourmet-cooking hardy paper-thin papery-skin pink-skinned-bulbs pink-tinge piquant quantity red-shallots shallot sweet