Fresh red onion is an essential vegetable needed for preparing vegetarian and non-vegetarian dishes. Onion can also be eaten raw as a part of salad; many people prefer vinegar onion along with the meals. It is important to store this vegetable in cool and well-ventilated place. It is possible to increase its shelf life by freezing the peeled and cut onion in an airtight container or resealable bag. Women in Indian households cook onions in large quantity and store that in refrigerator to regularly use them for around a week.