Non GMO. The taste you trust. Always ground from no. 1 grade mustard seeds. Add the tangy flavor, sharp aroma and zesty heat of our ground mustard to burgers, roast, sauces and marinades. mccormick.com. Flavor maker get app. Scan. Explore. SmartLabel. Questions? Call 1-800-632-5847. Packed in USA. Add the tangy flavor, sharp aroma and zesty heat of our Ground Mustard to burgers, roasts, sauces and marinades.