Do you fry onions in oil or butter?

Online Answer
The more fat in the pan, the more the onions will fry rather than soften. (Okay, you can fry them a little.) You can use just oil, or a combination of butter and oil—the choice is yours! If you pack too many onions into your pan, they'll steam and produce water.
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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.