What is the healthiest way to cook onions?

Online Answer
Onions contain a flavonoid called quercetin, which has anti-inflammatory properties. Cooking increases the total amount of flavonoids. Red and yellow onions have more flavonoids than white onions. Bake or sauté onions for 5 minutes.
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Kept in the dark: Davison says your potatoes should be stored inside a paper bag in a cool, dark, dry place. And as mentioned above, away from onions and their sprout-encouraging gases.
There are many ways of using garlic.
Keep them in the dark: Potatoes and onions are best stored in the dark in a cool place (separately of course).
Onions contain antioxidants and compounds that fight inflammation, decrease triglycerides and reduce cholesterol levels — all of which may lower heart disease risk. Their potent anti-inflammatory properties may also help reduce high blood pressure and protect against blood clots.
While the fridge isn't ideal for storing onions, it will extend the shelf life of whole, raw onions beyond a week at room temperature. Onions absorb moisture very easily however, so their texture may get somewhat soft in the fridge. Whole, raw onions can last in the fridge for up to two weeks.