White onion or Allium cepa (sweet onion) are a cultivar of dry onion which have a distinct light and mild flavour profile. Much like red onions, they have a high sugar and low sulphur content, and thus have a relatively short shelf life.
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Red onions (also known as purple onions in some European countries) are cultivars of the onion (Allium cepa), and have purplish-red skin and white flesh tinged with red. They are most commonly used in the culinary arts, but the skin of the red onion has also been used as a dye.
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