From the nutritional point of view, purple onion is more nutritious than white onion and yellow onion. It contains anthocyanins with strong antioxidant capacity, which can beauty beauty and make skin white, tender and smooth. The selenium contained in it has anti-aging effect, especially suitable for women who love beauty. The taste and water content of yellow-skinned onion are between purple skin and white skin, with moderate spicy taste and sweet taste, which is suitable for raw eating and cooking seafood. Everyone has different opinions about which kind of onion is the best. You can choose the onion that suits you according to your taste and the dishes you need to cook. Purple onion is the most spicy and has the strongest flavor. It is suitable for cooking, barbecue, side dishes and easy to store. People who value nutrition and like spicy food are advised to buy it. If you don't like spicy food, you can choose white-skinned and yellow-skinned onions. Raw food, barbecue and cold salad are all good. You can choose according to your taste.