Place sliced beef in a plate and season with salt. Set aside until ready to use.
Add in Oyster sauce, Hoisin Sauce, and soy sauce in a small bowl
Boil 6 cups of water in a medium sized pot.
Remove Udon noodles from package and add it into the boiling water and stir Udon it break up/separate noodles.
Drain in a colander. Set aside until ready to use.
Heat the sesame oil in low medium heat and add in the sliced beef. Cook until it changes color about 3 - 5 minutes. Remove meat from the pan.
Using the same pan, add in the veggies: bell pepper, mushroom,zucchini, carrots, snap peas ( whatever veggies you like, really).
Cook veggies until they are wilted and add in the meat and the Udon noodles.
Add the prepared sauces and mix until it coat the veggies and the meat.
Add more sauce according to your liking.
Turn of the heat and serve while it's hot.