01 - 
                Set oven temperature to 275°F.
              
              
              
                02 - 
                Mix ketchup, onion soup mix, and water in a large bowl until well combined.
              
              
              
                03 - 
                Place brisket in roasting pan, pour sauce over, flip to coat both sides.
              
              
              
                04 - 
                Seal pan tightly with foil, keeping it from touching meat and sauce.
              
              
              
                05 - 
                Roast for 7-8 hours until fork tender but not falling apart.
              
              
              
                06 - 
                Let rest 1-2 hours before slicing against grain into 1/2-inch pieces.