Mustard seeds are small, round seeds from the mustard plant (Brassica species) known for their robust flavor and culinary versatility. These seeds come in various colors, including yellow, brown, and black, each offering a unique taste profile and application in cooking. Mustard seeds are small, round seeds from the mustard plant (Brassica species) known for their robust flavor and culinary versatility. These seeds come in various colors, including yellow, brown, and black, each offering a unique taste profile and application in cooking. Mustard seeds are small, round seeds from the mustard plant (Brassica species) known for their robust flavor and culinary versatility. These seeds come in various colors, including yellow, brown, and black, each offering a unique taste profile and application in cooking.