Onions, also known as bulb onions, common onions, scallions, or shallots, are extremely nutritious and a special vegetable that combines nutrition, medical value, and health benefits. Similar to garlic, onions contain allicin and selenium sulfide, which can inhibit the synthesis of carcinogens and promote phagocytic cells to destroy cancer cells, thus having anti-cancer effects. Are purple-skinned onions more nutritious?
According to their skin color, onions can be divided into three types: white-skinned, yellow-skinned, and purple-skinned. White-skinned onions have tender flesh, high moisture content, and high sweetness. After long cooking, they develop a golden color and rich sweetness, making them more suitable for fresh eating, baking, or stewing, but with a lower yield. Purple-skinned onions have slightly reddish flesh and a strong pungent flavor, suitable for stir-frying, braising, or raw salads, but have poor storage stability. Yellow-skinned onions are mostly for export. Their flesh is slightly yellow, tender and delicate, sweet in taste, with a medium level of pungency. They are suitable for eating raw or with a dip, have good storage properties, and are often used as dehydrated vegetables.
In terms of nutritional value, purple-skinned onions are more nutritious. This is mainly because purple-skinned onions have a stronger pungent flavor, which means they contain more allicin. In addition, the purple skin of purple-skinned onions contains more quercetin, which is also a very beneficial health component for the human body. Therefore, the therapeutic effect of purple-skinned onions is much better than that of white-skinned onions. Onion red wine is a very magical health-preserving recipe. Wash and peel the onions, then dice them. If you choose purple-skinned onions, do not remove the purple skin, as it provides better health benefits when soaked in wine.