Ground mustard is a versatile spice that can be used in almost any savory dish for an added kick. It's a popular spice in traditional French, English, and Indian cuisines. Ground mustard is commonly used in recipes for dressings, marinades, and sauces for added depth and flavor. Among the host of nutrients, mustard powder contains a mineral called selenium. The nutritionist says that selenium shows antioxidant properties and facilitates DNA synthesis in the body. In addition, including mustard powder in your diet may also reduce the risk of cancer.