Kasundi is a unique and flavorful fermented mustard sauce that originates from West Bengal, India. It is a condiment that is usually added to dishes to give them an extra kick of flavor. Kasundi can be prepared in a number of different ways, but one variation that is particularly popular is aam kasundi, which is prepared with green mango. This variation of kasundi has a distinct flavor that sets it apart from other mustard-based condiments, such as dijon mustard. Unlike dijon mustard, aam kasundi has a tangy and sour taste that is sure to tantalize the taste buds. It is a great way to add a unique and delicious dimension to dishes, such as curries, rice dishes, and sandwiches.