Bring a pot of water to a boil and cook the noodles according to package instructions. Drain well and divide between serving bowls.
While the noodles are cooking, combine the chicken broth, dark soy sauce, soy sauce, rice wine/ sake, sugar, and Chinese five spice in a small bowl. Stir well to dissolve the sugar and set aside.
Heat a wok or heavy skillet over medium-high heat. Once hot, swirl in the oil to coat.
Add in the onion/shallots, and cook over medium-low heat. When the onion begins to soften, add in the minced garlic and give it a few stirs, and cook until fragrant.
Add in the ground meat, stir it constantly, and cook until the meat starts to brown - about two minutes. Add in the mushrooms and toss everything together, and cook for another minute.
Pour in the sauce mixture, stir to combine, and bring to a boil. Add a bit more water if you like your version to be more saucy.
Turn heat down and let simmer over low heat for another 5-8 minutes, until the sauce reaches desired thickness.
Add in dashes of toasted sesame oil and freshly ground black pepper. Serve the meat sauce mixture over the cooked noodles and garnish with chopped scallions.
For side veggies, you can add quick, blanched baby bok choy, bean sprouts, or shredded cucumbers/carrots.