½teaspoongochugaru (Korean red pepper flakes)for topping
Instructions
Marinate the beef slices with salt, pepper, and garlic powder. Mix the oyster sauce, soy sauce, dark soy sauce, and sugar together and set the sauce aside.
Boil the frozen udon for 1 minute and drain. Set aside.
Sauté the beef in a pan with oil until cooked, then set aside.
In the same pan, add more oil and sauté the garlic and onion. Add the rest of the vegetables and cook until just tender. Optionally, deglaze the pan with a splash of rice cooking wine. Don't overcook the vegetables or they'll turn soft and mushy; a little crunch is best.
Add the udon and sauce. Cook until the sauce has reduced and soaked into the udon. Taste and adjust with more soy sauce or sugar if needed.
Top with the cooked beef and green onion, and finish with a sprinkle of gochugaru.