Place beef in the crock pot /slow cooker.
Pour consomme' and oyster sauce over beef
Cover and cook for 6 hours on low or 3 hours on high settings
After 3 to 6 hours, stir 2 tablespoons of corn starch in a small amount of water. Stir until smooth. Add into the beef . Stir until cornstarch is incorporated.
Add in the broccoli.
Continue cooking on high setting for 15 more minutes.