Ground mustard, also known as powdered mustard or mustard powder, is a fine yellowish-brown powder made from grinding mustard seeds. It is derived from various species of mustard plants, primarily Brassica nigra, Brassica juncea, or a combination of both. Ground mustard is commonly used as a spice and condiment, adding a pungent, tangy flavor to a variety of dishes. It is a key ingredient in traditional mustard sauces, salad dressings, marinades, and pickles. Ground mustard can also be used as a seasoning for meats, vegetables, and cheese.