Add cut up steak to slow cooker.
In a small bowl, whisk together broth, soy sauce, garlic, brown sugar, and sesame oil. Pour sauce over beef in slow cooker.
Cover and cook on low for 5 hours or high for 3 hours. Beef should be tender.
In a small bowl or cup, whisk cornstarch and water together. Stir into slow cooker.
Add broccoli to slow cooker and stir again. Cook on low for 30 minutes. Broccoli should be tender, and sauce should be thickened.
Serve over rice and sprinkle with sesame seeds.