Add the beef to your crockpot. In a separate small bowl, combine consomme, soy sauce, brown sugar, oil, and garlic. Pour the mixture over the beef and cook on low for 6 to 8 hours. In a cup, stir cornstarch and some sauce form the crock pot until smooth. Add back to crock pot and stir well to combine. If your sauce is not thickening, try bringing your sauce to a boil on the stovetop with the corn starch mixture and boil until your desired thickness is reached. Add broccoli to the crock pot and mix. Cover and cook for another 30 minutes on high. Serve over hot cooked rice and enjoy!