Onion, Allium cepa, is an herbaceous biennial in the family Liliaceae grown for its edible bulb. The stem of the plant is a flattened disc at the base and the tubular leaves form a pseudostem where their sheaths overlap. The leaves are either erect or oblique and there are 3–8 per plant.
Nutrition Facts ( Per 100g ) :
Calories Calories 40, Total Fat 0.1 g, Sodium 4 40, Total Fat 0.1 g, Sodium 4 mg, Potassium 146 mg, Total Carbohydrate 9 g, Protein 1.1 g, Calcium 2%, Calcium 2%, Iron 1%, Vitamin B Vitamin B-65%, Magnesium 265%, Magnesium 2%.