This traditional mustard packs a punch with the addition of horseradish, creating a truly distinctive condiment to enliven roast dinners and cold meats. Adding heat and depth to dishes, this Mustard with Horseradish makes a fiery partner to a plate of roast beef, but can also be used to add a flourish to cheese sauces or smoked fish. Alternatively, add a spoonful to some crème fraiche for an indulgent topping for jacket potatoes.