In a large pot, bring salted water to a boil. Add the fettuccine and cook according to package instructions until al dente. Drain the pasta in a colander, making sure to reserve about 1 cup of the pasta cooking water for later use. Set the drained pasta aside.
In a medium mixing bowl, combine the sliced flank steak with soy sauce, honey, sriracha, garlic powder, and ground ginger. Mix well to ensure the steak is evenly coated. Cover and let it marinate in the refrigerator for a minimum of 15 minutes to absorb the flavors.
In a large skillet, heat the olive oil over medium-high heat until shimmering. Add the marinated flank steak to the skillet, spreading it out in a single layer. Cook for 5-7 minutes, stirring occasionally, until the steak is nicely browned and cooked to your desired doneness. Once cooked, transfer the steak to a plate and cover with foil to keep warm.
In the same skillet, add the sliced red bell pepper and snap peas. Sauté for 3-4 minutes, stirring frequently, until the vegetables are vibrant and tender yet still crisp.
Lower the heat to medium. Add the cooked fettuccine to the skillet along with the sautéed vegetables. Gradually pour in some of the reserved pasta water, mixing well to achieve your desired sauce consistency. Start with half a cup and add more as needed.
Return the cooked flank steak to the skillet. Toss everything together gently but thoroughly, allowing the flavors to meld. Season with salt and freshly ground black pepper to taste.
Remove the skillet from heat and transfer the pasta to a serving dish or shallow bowls. Sprinkle with chopped green onions and generously garnish with fresh cilantro leaves for a burst of color and flavor.
Notes
For an elegant touch, serve the pasta in a shallow bowl, garnished with an extra sprinkle of cilantro and a few green onion tops for a pop of color. Enjoy immediately!