Cook spaghetti according to directions on the box. Drain and rinse pasta, then toss with 2 tablespoons sesame oil.
Next, combine peanut butter, soy sauce, seasoned rice vinegar, chili sauce, water, brown sugar, garlic, ginger, and remaining tablespoon of sesame oil in a mixing bowl. Toss the pasta with the peanut sauce mixture, the carrot, the green onion, and cucumber.
Transfer to a serving dish and garnish with sesame seeds,remaining carrot and remaining green onion.
Source: Freshman in the Kitchen