Onion 洋葱 （ yáng cōng ）
Classification: Genus Allium in the family Liliaceae
Calories: 40kcal/100g
Nutritional Value: Beauty and skincare、Protecting cardiovascular and cerebrovascular health
Not Suitable for: Stomach disease
Introduction: Onions themselves contain trace element selenium, which is a powerful antioxidant that can enhance cellular vitality and delay aging.Purple onions, in particular, have anthocyanins in their outer skin, which possess excellent anti-aging benefits.Onions are rich in nutrients, including potassium, vitamin C, folate, zinc, selenium, fiber, and two unique compounds—quercetin and prostaglandin A.These two compounds give onions various health benefits that cannot be replaced by many other foods.When selecting onions, check their appearance for intact shape, even size, fullness, firmness without cracks, insect spots, sprouts, or rot.Examine the surface for smoothness with minimal differences in diameter.When weighing onions, hold them in your hand to feel their weight; the heavier, the better.In terms of texture, press the onion with your hand—it should be firm, solid, and not soft.