Preheat the oven to 425 degrees and line a baking sheet with parchment paper.
Combine the miso, syrup and vinegar in a bowl and set aside.
Trim the ends of the brussels sprouts, remove any wilted leaves and cut in half. Add the sprouts to the baking sheet and drizzle with olive oil and white pepper. Toss to coat evenly and place all of the sprouts cut-side down. Bake for 15 minutes. Remove from the oven and drizzle with the miso sauce. Toss and place back in the oven for 5-10 minutes, or until desired crispiness is reached. Remove from the oven.
While the sprouts are cooking bring a pot of water to a boil. Add the noodles and cook until tender - make sure not to overcook them. Drain, rinse with cold water and place the empty pot back on the stove over medium heat.
Add the sesame oil, garlic, ginger and onion. Cook down for a couple minutes, or until the onions start to get tender. Add the beef crumbles, hoisin, soy sauce and vinegar. Toss to combine everything. Add 1/2 the green onions and the noodles to the pot and toss until heated through.
Serve the noodles topped with the brussels sprouts and the rest of the green onions. Give each plate a drizzle of sesame oil right before serving.
Video
Notes
I used instant ramen noodles - just ditch the seasoning packet.
These noodles aren't overly saucy. If you want a more saucy consistency you can double the sauce.