
Bring a large pot of salted water to a boil. Cook the spaghetti or linguine until just al dente, then drain and toss with a small drizzle of oil so the noodles do not stick. In a bowl, whisk together the soy sauce, black vinegar, chili garlic sauce, hoisin sauce, brown sugar, sesame oil, cornstarch, and water until smooth.


Heat 1 tbsp vegetable oil in a wok or large skillet over medium-high heat. Add the shrimp in a single layer and sear for about 2 minutes per side, just until pink and nearly cooked through. Transfer the shrimp to a plate, then add the remaining oil, garlic, chilies, carrot, and bell pepper to the pan; stir-fry for 2 to 3 minutes until the vegetables are crisp-tender.



Pour the sauce into the hot pan and stir until it begins to thicken. Return the shrimp to the pan, add the cooked pasta, and toss over high heat until the noodles are evenly coated and the shrimp is fully cooked. Finish with sliced scallions and extra chili oil, if desired, and serve immediately.







