In a small bowl, stir the cornstarch and water together until no lumps remain, creating a slurry
Add the cornstarch/water slurry to the juices in the slow cooker and turn the slow cooker up to high
Put the lid on and cook for 10 minutes or until the gravy boils
Notes
Which cut of beef roast should I buy for the crockpot?My favorite beef roast cuts for the slow cooker are the arm roast and the chuck roast. I don't enjoy a rump roast in this application.