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One such wonderful plant is onion. Onion is one of the oldest cultivated herbs. According to the United Nations Food & Agriculture Organization, Pakistan is the fifth leading onion producing country now.

It is wonderful vegetable. It would have been a fruit if it had not been pungent and full of sulphuric compound. It comes in varying shapes and sizes; and has beneficial properties for health particularly being fat free.

This vegetable is most often used to enhance flavors in a wide range of recipes, casseroles, pizzas, soups, stews and salads. Onions are also processed for fresh consumption. Onions are a vegetable for all seasons and tastes.
Recent research has suggested that onions in the diet may play a part in preventing heat disease and other ailments. Onion bulb is rich in phosphorus, calcium and carbohydrates. The pungency in onion is due to a volatile oil know as 'allyl-propyl disulphide. Its taste is sweet and pungent. It is an appetizer and helps in digestion of food. It is a source of energy and acts as stimulant increases vigor and vitality, acts as an expectorant and diuretic and slows the heart beat, prevents flatulent and dyspepsia.