Cook the udon noodles according to package instructions. Drain and set aside.
In a blender, combine the tofu, sesame paste, and MSG. Blend until completely smooth and creamy. Set aside.
Heat a drizzle of oil in a pan over medium heat. Add the white parts of the green onions and minced garlic; sauté until fragrant.
Add the ground beef and cook, breaking it up, until fully browned.
Stir in the doubanjiang, cooking wine, and soy sauce. Cook for another 1–2 minutes until well combined and aromatic.
To assemble, add the udon noodles to a bowl or plate. Top with the ground beef mixture, then pour the creamy tofu sauce over everything.
Garnish with the green onion greens and drizzle with chili oil if desired.
Mix well and enjoy immediately.