Here’s how you can bring this cozy dish to life in your own kitchen:

1. Start by slicing your flank steak thinly. This is where a good sharp knife comes in handy, and it’s a great way to involve the kids safely under supervision.
2. In your slow cooker, combine the beef broth, soy sauce, brown sugar, sesame oil, and minced garlic. Stir well to ensure all flavors blend together.
3. Add the sliced beef to the mixture, making sure it’s well-coated. Cover and cook on low heat for about 5-6 hours, or until the beef is tender.
4. About 30 minutes before serving, whisk together the cornstarch and water in a small bowl until smooth. Pour this mixture into the slow cooker and stir to thicken the sauce.
5. Add the broccoli florets. Cover and cook for an additional 30 minutes on low, or until the broccoli is cooked to your desired tenderness.
6. Season with salt and pepper to taste before serving.

Remember, cooking is an art, not a science. Feel free to taste and adjust as you go!