I enjoy onion in cooking and add it to almost all dishes. Onions are more of a luxury than a necessity though. While they do have nutrients that make them good for you, the nutrients are found elsewhere in food in much higher concentrations. They are also a food that while I like to use it, don’t necessarily have to be added and the food still tastes right with just less flavor perhaps. They are cheap, plentiful and used in almost every cuisine though. I use different types of onions for different types of cooking.