Mix the soy sauce, rice vinegar, sesame oil, ground ginger, Aleppo pepper, garlic powder, and black pepper together in a bowl until combined. Set aside.
Put the pasta in a large pot with salted water. Have ready a steamer insert that can sit on the pot. Put the broccoli in the steamer and set it aside.
Bring the pasta to a boil and boil until it is almost al dente, then steam the broccoli until it is tender-soft.
Put the broccoli in a large bowl, drain the pasta, and add it to the bowl. Pour the sauce over and toss all together. Garnish with green onions and sesame seeds.
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