Mustard is a condiment made from the seeds of a mustard plant. The whole, ground, cracked, or bruised mustard seeds are mixed with water, vinegar, lemon juice, wine, or other liquids, salt, and often other flavorings and spices, to create a paste or sauce ranging in color from bright yellow to dark brown. Mustard contains antioxidants and other beneficial plant compounds thought to help protect your body against damage and disease. For instance, it’s a great source of glucosinolates, a group of sulfur-containing compounds found in all cruciferous vegetables, including broccoli, cabbage.