Rinse the corned beef brisket under cold water
Place the brisket in the crock pot, fat side up
Add the seasoning packet that came with the corned beef
Add 1 to 2 cups of water, beef broth, or a mix of both
Add optional aromatics such as onion, garlic, bay leaves, or peppercorns
Cover and cook on low for 8 to 10 hours
Add potatoes, carrots, and cabbage during the last 2 to 3 hours if desired
Check that the corned beef is fork-tender before removing
Let the meat rest for 10 to 15 minutes before slicing
Slice against the grain and serve