Small onions, or shallots, are low in calories, with about 40 calories per 100 grams. They are a good source of vitamins such as vitamin C, vitamin B6, and folate (vitamin B9). Small onions also provide important minerals like potassium, calcium, and iron. Known for their milder, sweeter flavor compared to regular onions, they are rich in antioxidants, including flavonoids, which help reduce inflammation and support heart health. Small onions are commonly used in curries, chutneys, salads, and as a garnish, adding depth of flavor to a variety of dishes.