A vegetable with a very strong smell and flavor made up of several layers surrounding each other tightly in a round shape, usually brown or red on the outside and white inside.
One small onion contains about 28 calories and 7 grams of carbs. Onions are also rich in vitamins A, B6, B-complex, and C, as well as iron, folate, and potassium. They are excellent sources of sulfuric compounds, flavonoids, phytochemicals, and polyphenols.
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