Step 1: Cook the Spaghetti - Bring a large pot of salted water to a boil. Add the whole-wheat spaghetti and cook according to package instructions until al dente, about 8-10 minutes.
Step 2: Drain the Noodles - Once cooked, drain the spaghetti in a colander and rinse briefly under cold water to stop the cooking process.
Step 3: Prepare the Sauce - In a mixing bowl, combine lite soy sauce, sesame oil, and rice vinegar. Whisk until well blended.
Step 4: Toss the Noodles - Add the drained spaghetti to the bowl with the sauce and toss well to coat the noodles.
Step 5: Serve and Garnish - Transfer the noodles to a serving bowl and garnish with chopped green onions if desired. Serve immediately.
