Cook the thin Chinese wheat noodles according to package’s instructions. Drain, rinse, and set aside.
In a small bowl, make the sauce by combining the tian mian jiang, dou ban jiang, soy sauce, and sugar. Stir until well combined. Set aside.
Heat oil in a wok or large saute pan on medium high heat. Saute the garlic, ginger, and white parts of the green onions for 2 minutes. Then add the mushrooms and saute for 5 minutes.
Add the tofu, vegetable broth, and sauce mixture. Stir, then add a few twists of fresh cracked black pepper and cook for 2 minutes. Add the sesame oil and the green parts of the green onions. Stir and simmer on medium heat for 10 minutes or until sauce thickens and the liquid is mostly evaporated.
Divide noodles into bowls. Serve zha jiang mixture on top of noodles with some julienned cucumbers and carrots. Enjoy!