Pan fry the beef side in a pan over medium high heat. Add in 150ml water and cook for 1 min
Drain the tofu mixture over sieve. Discard all the oil and water. Put the tofu mixture ban into the pan
Add in the chicken broth and bring it to boil over high heat. Cover the pan with a lid. Turn the heat to low. Simmer for 5-10 mins
Place the tofu mixture into a dish. Bring the broth to boil again over high heat. Add in the sauce mixture and mix it well.
Add enough starch mixture to thicken the sauce. Turn off the heat. Add in the egg white. Stir until the egg white is cooked through. Pour the sauce mixture over the tofu mixture. Serve it hot.