Soak Yakisoba noodles with water to separate. Set aside.
In a small bowl mix the soy sauce and vinegar. Set aside.
Heat the cooking oil and saute' the pork in high heat until cook through. Add in the shrimps until orange in color. Season the meat with salt and transfer to a plate.
In the same skillet,cook onion until transparent. Add in broccoli and carrot until soft but not soggy ( I like my vegetables to be crunchy).
Drain Yakisoba noodles and gently separate. Add into the vegetables mixture. Add in the meat and season with the soy sauce mixture. Let cook for additional 5 minutes.Serve hot.