Step 1

Cook the spaghetti or rice noodles according to the package instructions. Drain and set aside.

Step 2

In a large skillet, heat vegetable oil over medium heat. Add the sliced red onion and sauté until soft, about 3 minutes.

Step 3

Add minced garlic to the skillet and cook for an additional minute, stirring constantly to prevent burning.

Step 4

Reduce heat to low and stir in the fish sauce, oyster sauce, soy sauce, and sriracha, mixing well to combine.

Step 5

Toss the cooked noodles into the skillet, ensuring they are evenly coated with the sauce. Cook for another 3-4 minutes, allowing the flavors to meld.

Step 6

Drizzle with sesame oil, if using, and toss again.

Step 7

Serve hot, garnished with chopped green onions and sesame seeds, if desired.