The sweet onion, originating from Vega de Aranjuez and nearby areas, is a variety of yellow onion characterized by its intense flavor. This onion is fundamental in cooking, serving as the base for many dishes like stir-fries, stews, creams, and sauces. Its texture and smell make it a perfect ally in gastronomy, whether raw, fried, or roasted, where it reveals its full flavor. With a content of 40.0 kcal per 100 g, along with its water and nutrient contribution, it is a versatile ingredient that can be enjoyed all year round. Storage is key: it is advisable to remove the first dry layer and store it in a cool, dry, and ventilated place.