Onions are versatile bulb vegetables known for their pungent aroma and layered structure, offering a savory, slightly sweet flavor that deepens with cooking. They have a crisp, crunchy texture when raw and become soft and caramelized when cooked, adding depth to a wide variety of dishes. Widely used across international cuisines—from French soups and Indian curries to Mexican salsas and Middle Eastern stews—onions serve as a foundational flavor base. Historically, onions have been cultivated for thousands of years, valued not only for their culinary uses but also for their supposed medicinal properties in ancient civilizations.