2. Nutrition: White onion is better than purple onion in nutrition, especially a long white onion, which is called "health onion". Soaking purple onion with red wine has great protective and therapeutic effects on male prostate diseases.
3. Preservation: Because white onions are thicker than purple onions, they are relatively difficult to preserve.
4. Usage: Of course, they are all eaten in the stomach, but white onions are more suitable for cold dishes, not spicy or sweet. Purple onion is suitable for frying, especially with beef and bell pepper. It's also delicious to put some purple onions on the barbecue. I'll teach you a dish: beef tenderloin is fried with butter, with purple onion, red and green bell pepper and a little seed when frying.