¼cupbeet juice(or juice from homemade sauerkraut made with purple cabbage, optional - it's just for color)
Make the brine by putting the water, salt, sugar, and spices (except beet juice or sauerkraut juice) in a large pot and heating, stirring frequently, until sugar and salt dissolve. Cool liquid, using 2 cups of ice if needed, and place in refrigerator until very cold. It is very important that the brine is cold before it comes in contact with the meat.
For the 3-5 day brining process, you can either place the brisket in a large 2-gallon bag and add the brine, or place the brisket in a large glass container with a lid and add the brine. Either way, you want the brisket to be completely submerged and surrounded with the brine. Add the beet juice or sauerkraut juice (if using) at this point.
Place in the fridge (if you use the plastic bag put it inside another dish in case it leaks) and leave it there for at least 3 days (5 days if possible). Each day, flip it over and move the brine around.
After 3-5 days, remove from the brine, rinse well with cool water, and cook as you normally would a corned beef brisket. (Don't normally cook a corned beef brisket? See this recipe.)
Make sure your brine is completely cold before using and make sure you submerge your meat completely.