Some spices commonly used to make corned beef include: allspice, cinnamon, coriander, ginger, peppercorn and cloves. For an extra bit of taste, some cooks add fresh garlic. Corned beef brisket bought in a package may have already been seasoned, so it's good to cook a small piece and taste first.
Making the best corned beef not only includes choosing just the right balance of spices, but also selecting a nice cut of brisket, making sure that it is fresh and a deep, red color. To add a twist to the spices, add a glass of stout ale to the corned beef to infuse it with more flavor and keep it moist.