Spring onions are immature onions harvested before their bulb has swollen.
Many supermarkets stock spring onions when they are in season, and they can also easily be grown at home; you can even use bulbs from the supermarket as a starter for your own spring onions. They are normally sold in bunches and should be firm with crisp white bases and undamaged green tops.
Spring onions have a strong flavour and may be cooked or used raw. They are commonly chopped and diced and used in salads, omelettes, mashed potatoes or when preparing salsa. They are also used to garnish fish and noodle dishes.
Store your spring onions in a plastic bag in your fridge, or upright in a small glass of water. When cooking, toss quickly and be careful not to burn them.