Boil the noodles/spaghetti as per packet instruction. I like to run cold water through cooked noodles. Add 1 tbsp of oil to it and mix it well so they don't stick to each other. Keep it aside.
Heat 4 tbsp oil in a wok. Saute grated ginger, minced garlic and thinly sliced serrano pepper for a minute.
Add sliced onions, peppers, carrots and cabbage to it and cook on high flame for 4-6 minutes. Making sure they don't get soggy. Cooking them on high flame for short time keeps the crunch and helps get rid some water from the veggies.
Once those veggies are partially cooked, add soy sauce, rice vinegar, sriracha sauce, salt and pepper. Mix it well.
Add cooked noodles/spaghetti to it and mix very well. Cook for couple of minutes. Add chopped cilantro and scallions. Mix it well and server!