Crispy fried onion slices in bowl with a spoon on a kitchen towel - Bhofack2/Getty Images Onions are an undeniable kitchen staple, which is why picking the best onions at the grocery store is crucial.

I love caramelized onions. They can transform a simple burger into something gourmet, instantly upgrade a pasta or legume dish, and add some sweet-savory depth to just about anything. If I am honest, ...