Bring a large pot of salted water to a boil and cook the pasta until al dente according to package instructions.
Reserve about 1 cup of pasta water, then drain the pasta and set it aside.
In a small bowl, mix soy sauce, honey, sriracha chilli sauce, Manchurian sauce (optional), and black pepper until well combined.
Taste the sauce mixture and adjust by adding more honey for sweetness or more sriracha for extra heat if needed.
Heat oil in a pan over medium heat and sauté the sliced mushrooms until they release moisture and turn slightly golden.
Pour the prepared soy sauce mixture into the pan with the mushrooms and cook for 2–3 minutes.
Add the mixed herbs and cook for about 30–40 seconds until fragrant.
Stir in the smoked paprika powder and red chilli flakes.
Add a splash of the reserved pasta water and stir well to create a glossy sauce.
Add the cooked pasta to the pan and toss until the pasta is evenly coated with the sauce.
If the pasta looks dry, add more pasta water little by little while tossing.
Cook for another 1–2 minutes until the sauce clings to the pasta and adjust seasoning if needed.
Serve hot topped with oregano and extra chilli flakes if desired.