Dice carrots, broccoli and onion into two-inch pieces. Pre slice beef into very thin strips. Using a hot skillet with sesame oil, cook beef until it's golden brown, remove from the skillet and set aside.
Using the same skillet that was used to cook beef, sautee onions until golden brown with sesame oil. Remove from the skillet. In the same skillet, saute carrots until softened, add broccoli and cook for about three minutes. Press garlic into the same mixture.
Add cooked beef into the skillet with vegetables. Pour sauce over the ingredietns and let them simmer for about 2 minutes.
Add cooked noodles and toss everything together.
Into a large dish, combine noodles, vegetables and beef. Toss to bring everything together and serve while it's still hot.