Slice the beef into strips about half an inch thick.
Marinate in soy sauce and vinegar for about one hour.
Then fry the marinated beef until golden brown and set aside.
Boil the beef or chicken liver and fry it the same as you did in the beef strips. Set aside.
Slice the fried livers into medium size cubes. Set aside.
In a wok or a heavy skillet, heat about 1 tablespoon oil and saute garlic and onion, chili and bell pepper.
Then pour about 1/2 cup of the soy sauce and vinegar mixture from the beef marinade.
Simmer for a few minutes then add the pepper and beef broth cube.
Add salt according to your desired taste. Then pour it on the fried beef strips and liver.
Put the mayonnaise and some lemon juice to give a little sourness and mix until all the ingredients are well coated with mayo.