Cook the thick spaghetti per package instruction until al dente. Set aside while preparing the vegetables.
Heat the vegetable oil in a small wok or medium heavy frying pan over medium-high heat. Add the garlic and saute until fragrant, about 30-45 seconds.
Add the soy sauce, white vinegar, and balsamic vinegar and stir until mixed. Turn the heat off and stir in the cilantro, green onion.
Add the noodles to the pan. Stir in the chili sauce. Turn the heat up to high and continue cooking, toss the noodles until the sauce sticks to the pasta.
Transfer into a bowl, top with the cucumber and serve immediately.
Notes
Instead of the white vinegar and Balsamic mix you can use a tradiitonal Chinese black vinegar, which can be purchased from an Asian grocer or on Amazon.
Optional, add sesame seeds to the stir-fry in step 3.