In a mixing bowl, whisk together the beef stock, sesame oil, soy sauce, brown sugar, and minced garlic.
1 cup beef stock, 1/3 cup soy sauce, 1 teaspoon sesame oil, ⅓ cup brown sugar, 3 cloves garlic
Add the beef to the slow cooker and pour the liquid over the top, tossing the beef to coat.
1 lb stew beef
Set the slow cooker to cook for 4 hours on HIGH heat.
When the meat is tender, remove a 1/4 cup of the sauce and put in into a small bowl. Add the cornstarch to the sauce and whisk with a fork to combine.
2 tablespoons cornstarch
Slowly drizzle the cornstarch mixture to the slow cooker and stir into the sauce.
Add the broccoli florets to the slow cooker and cover.
Frozen broccoli florets
Cook for another 30 minutes on low so the sauce will thicken and the broccoli will cook.
Season with salt and pepper as desired and serve over white or brown rice.
salt and pepper, to taste