Marinated Beef (Sirloin) - cooking recipe

Ingredients

3 lb. sliced beef (3/4 of an inch thick)
1/4 c. soy sauce
1/2 c. fresh lemon juice
pinch of ground pepper
6 to 8 Tbsp. oil
2 medium onions, cut round

Preparation

Put the sliced beef in a deep container.
Add soy sauce, ground pepper and lemon juice.
Marinate for an hour.
Turn the beef once in a while and let it soak.
In a frying pan, put oil. Wait until the oil is hot and then fry the beef (medium fine) for 3 minutes.
Turn and cook for 2 minutes.
After the beef is cooked, take it out of the pan and put it aside.
In the remaining oil, put the onions and the rest of the marinade.
Stir for 2 minutes and add the beef to it.
Cover the pan and turn off the fire.