BEFORE YOU BEGINIt doesn’t matter which flavor of ramen noodles you buy since you won’t be using the seasoning packets sold with the noodles. Don’t discard the packets; you can use them to flavor freshly popped popcorn. Serve the noodle bowls with Sriracha hot sauce.
Whisk 1 tablespoon hoisin, 1 tablespoon soy sauce, and cornstarch together in bowl. Add pork and toss to coat; set aside. Whisk broth, remaining 3 tablespoons hoisin, and remaining 2 tablespoons soy sauce together in second bowl; set aside.
Heat 1 tablespoon oil in a 12-inch nonstick skillet over medium-high heat until shimmering. Add mushrooms and cook until browned, about 5 minutes.
After you start the first pan cooking, get the protein cooking. Heat 1 tablespoon oil in another 12-inch nonstick skillet over high heat until just smoking. Add pork in single layer, breaking up any clumps, and cook without stirring until browned on bottom, about 1 minute. Stir and continue to cook until pork is no longer pink, about 1 minute longer. Once cooked, pull off heat as you continue to work through the remaining steps.
Back in the mushroom pan, add ginger and garlic and cook until fragrant, about 30 seconds. Add broth mixture and bring to boil. Arrange noodles in skillet in single layer; cover and reduce heat to medium. Cook until noodles have softened on bottoms (tops will still be dry), about 3 minutes.
Uncover skillet and, using tongs, flip noodles and stir to separate. Spread noodles in even layer and scatter broccoli over top. Cover and cook until noodles and broccoli are tender, about 3 minutes, tossing halfway through cooking.
Build your noodle bowls! Divide noodle mixture evenly among individual bowls, then top with pork, and serve with scallions and sriracha.