White onion

The white onion (Allium cepa) is a variety of onion, a biennial flowering plant grown as an annual vegetable. It is native to Asia and is cultivated worldwide for its bulb, which is used as a food ingredient. Onions are typically grown from sets or seeds and harvested when the bulbs are mature and the tops have withered.

White onions are widely used in cooking for their pungent flavour and aroma, adding depth to a vast range of savoury dishes. Manufacturers incorporate them into products like sandwiches, ready meals, soups, sauces, and meat analogues for their characteristic taste and texture. They can be used fresh, sautéed, roasted, or caramelised to enhance the overall flavour profile of a food.

White onion is a common food ingredient and not considered a food additive under UK law. It is a source of various nutrients and beneficial plant compounds. While onions are generally considered healthy, no specific regulatory body has set an acceptable daily intake (ADI) for them as a food. Research into the health effects of onion consumption is ongoing, with some studies suggesting potential benefits related to cardiovascular health and antioxidant activity, though evidence can be mixed and more peer-reviewed research is needed.