Onions are  cool season vegetables that grow best at temperatures of 12 to 24 °C . Their taste is wonderful when they are cooked in the right way . Medditeranean salads contain onions . Onions are low in saturated fat, cholesterol and sodium. It is also a good source of dietary fiber, Vitamin B6, folate, potassium and manganese, and a very good source of Vitamin C.You can easily add onions in your salad or cook them with some olive oil .
100 gr of onions contain :
-40 kcal                                -Vitamin A  2 IU
-total fat 0,1 g                    -Vitamin C  7.3 mg
-cholesterol 0 mg             -Vitamin B6 0,1 mg
-sodium 4 mg                     -Calcium 22.5 mg
-potassium 146 mg           -Iron 0,1 mg
-Total Carbohydrate 9 g   -Magnesium 10mg
-Dietary fiber 1.7 g           
-Sugar 4.2 g
-Protein 1.1 g