In bowl, mix soy sauce & sugar together. Add the cooking oil in a wok or large saute pan on high heat and swirl to coat. When the cooking oil is hot but not smoking. Fry onions and carrots, until just softened, about 1 minute. Add the garlic, scallions and mushrooms, fry 30 seconds. Then add the spinach, soy sauce, sugar and the noodles. Fry 2-3 minutes until the noodles are cooked through. Turn off heat, toss with sesame seeds and the remaining 1 1/2 tsp of sesame oil.