- Combine all sauce ingredients in a small bowl. 
- To prepare your noodles from frozen, soak them in hot water for about a minute, and carefully loosen the noodles. Otherwise if you want to use packed udon noodles, then put in a pot with boiling water for 1-2 minutes until the noodles are loose. Drain them then set them aside. 
- Heat a wok or a large pan over medium heat and add vegetable oil together with the tofu, shrimp or any protein source that you prefer. Cook well and set aside. 
- In the same wok, add vegetable oil, onion, and cabbage, and sauté for a few minutes until the edges are golden brown, for about 3-4 minutes. 
- Add garlic, carrot, and mushrooms, and continue to cook for about 1 minute. 
- Now return your cooked tofu (or shrimp) and the udon noodles back in the wok 
- Add the sauce, and toss them together until the noodles are evenly coated and caramelized. 
- Garnish with sesame seeds and green onions and enjoy!