Combine the corn starch with the beef stock and mix until no lumps remain.
Add the rest of the ingredients and stir well. Set aside.
For the Stir Fry
Season the meat with salt, pepper, cumin, and garlic powder to taste.
Cook the meat in 1 tablespoon of sesame seed oil until it is browned on all sides. Set aside.
In the same skillet where you cooked the meat, add another tablespoon of sesame seed oil and cook the vegetables for about 3 minutes.
Add the meat back to the vegetables and add the sauce from above.
Cook for two minutes and serve immediately over rice or noodles.
Notes
To prevent the veggies from being soggy, make sure that they are completely dry when you start cooking them. Also, make sure only to cook for about 3 minutes before adding the meat back in.