How to Make It
Cook noodles according to package directions, omitting salt and fat. Drain well, and divide evenly among 4 shallow bowls.
Heat a large nonstick skillet over medium-high. Add pork, onion, and mushrooms; cook until pork is cooked through and mushrooms are tender, about 10 minutes. Stir in miso, chili garlic sauce, stock, and carrots; bring to a boil over high. Cook until carrots are crisp-tender, about 3 minutes.
Top noodles with pork mixture. Drizzle servings evenly with soy sauce, and top evenly with scallions.