In the insert of the crockpot whisk together beef broth soy sauce sesame oil minced garlic and brown sugar.
Place slices of beef in the liquid and toss to coat.
Cover with lid and cook on low heat for 4 hours.
After 4 hours, whisk together cornstarch and water in small bowl. Pour into crock pot add the broccoli and gently stir to combine.
Cover with lid and cook 30 minutes to cook broccoli and thicken sauce.
Serve with warm white rice.,Enjoy!