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 allium-cepa Amaryllidaceae brown-onions circular crisp donut-onions doughnut-onions firm flat flat-top flattened Italian-heirloom juicy mild-aroma papery-skin produce salad-vegetable saucer-shaped-bulbs shape soup-vegetable squat stir-fry-vegetable variety