Frasier suggests keeping onions in the pantry until they’re cut. After they’re sliced, then you can put them in the fridge.
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How To Store Onions In Your Kitchen

Learning how to store onions properly is the best way to ensure they remain fresh and flavorful for as long as possible.
You don’t need any fancy equipment to make them last longer. How to keep your onions, garlic, and ginger fresh for months [supnahomes] If you’ve ever bought onions, garlic, or ginger only to find them ...
With proper storage, you can keep your onions fresh for a much longer time. How to store onions the right way so they last longer [Bagels and Lasagna] Onions are a key ingredient in many of our ...
They are essential ingredients in so many dishes, adding depth and flavor. But sometimes when you reach for a clove or two of garlic or an onion, you may find they have sprouted or spoiled. What's the ...
Onions are ready for harvest about two-and-a-half to four months after planting. You'll know they're ready when their leaves start to flop over. After you harvest them, make sure to cure your onions ...