Whisk together all the sauce ingredients and set aside. Start a large pot of water to boil.
Heat the sesame oil in a large saute pan or wok over medium high heat. Add the vegetables and allow them to cook undisturbed for a minute or two. We really want to get some nice browning and sear on those veggies, so resist the urge to stir constantly!
Toss and continue to cook the vegetables until softened, about 5-7 minutes. Meanwhile, add your ramen noodles to the pot of boiling water.
Stir in the sauce and beef. Make a slurry with a teaspoon or cornstarch and 1 Tablespoon water. Stir in the slurry and adjust the heat so the sauce is at a slow simmer. Cook for 2-3 minutes or until the sauce is slightly thickened.
When the noodles are done, drain them and add them to the pan with the sauce, stirring so the sauce coats all the noodles. Top with chopped green onions and toasted sesame seeds and serve!
Notes
If you prefer not to make the shredded beef, you can also use thinly sliced steak for this recipe. Slice a ribeye, skirt, or flank steak in thin strips against the grain. Sear the steak in the sesame oil first, before adding the vegetables. Remove the steak from the pan, then add them back in when you add in the sauce.