Daidai is a type of bitter orange, scientifically known as Citrus aurantium. It is native to Asia and is often used in traditional medicine and culinary applications. The fruit is small, round, and typically has a thick, bumpy skin. Its flavor is quite sour and bitter, making it less popular for direct consumption but useful in various recipes and herbal remedies. In addition to its culinary uses, daidai is also significant in Chinese medicine. It is believed to help with digestion and is often included in herbal formulas. The fruit's peel is sometimes used to make essential oils, which are valued for their aromatic properties.