Step 1

Preheat oven to 350 degrees F. Coat a large roasting pan with cooking spray.

Step 2

In a medium bowl, combine ketchup, mustard, and brown sugar. Remove 1 cup of sauce to a small bowl and add water to it; mix well and pour into pan

Step 3

Place brisket in pan and pour the remaining sauce over meat. Cover tightly with aluminum foil.

Step 4

Roast 3 to 3-1/2 hours or until meat is fork-tender. Remove from pan and let rest 5 minutes before carving across the grain. Serve topped with pan drippings.