Wholegrain seeds of mustard blended through a smooth mustard paste. Try Wholegrain Mustard with meats and cheeses. Combine Maxwell's Treats Wholegrain Mustard with mayonnaise for the perfect base to your pasta or potato salad or mix with balsamic and oil for a incredible salad dressing. Wholegrain Mustard Ingredients: canola oil, vinegar, mustard flour & seed, sugar, spice garlic, salt.