Cooked rice, for serving
Toasted sesame seeds for garnish, optional
3 tbsp. Cornstarch
3 tbsp. Water
1 pound Broccoli florets, diced into bite-size pieces
1/8 tsp. Red pepper flakes
2 tbsp. Sesame oil
1/3 cup Brown sugar
1/2 cup Soy sauce
3/4 cup Beef broth
4 cloves Garlic, minced
1 Medium onion, finely chopped
2 tsp. Olive oil
Fresh ground pepper
1 1/2 pounds Boneless beef chuck roast, well trimmed and sliced into thin strips