(Allium cepa)     Description   The Onion belongs to the family of Liliaceae. Its small black seed is prismatic but irregularly shaped. Onion sprouts require quite a long time to grow: they reach their complete development after about 10-12 days of germination, keeping the seed at a temperature of 20-25° C. A proper irrigation is important, as excessive watering may favour moulds.   Properties   Onion sprouts are highly nutritive: they are rich in amino-acids, enzymes, vitamins A, B, C and minerals such as Calcium, Phosphorus, Potassium and Sulphur, which are necessary for cellular renewal. Onion sprouts are digestive and diuretic, have antiseptic properties and a good antibiotic power.