Filipino Beef and Onions (Bistek)

This is so yummy.  Another recipe that when I make at home does not last very long.  This is one of my mother's favorites as well.  It so simple to make and quick.  This can be prepared while waiting for the rice to cook. If you love liver and onions, this is a great recipe. Just change the beef for thinly sliced liver.

Ingredients:
2 lbs beef skirt or sirloin (thinly sliced)
6 tblsp soy sauce
Juice of 3 lemons - separate 1 of lemon juice
2 onions (sliced into rings)
3/4 cup of water
1 tblsp oyster sauce
Salt and pepper
1 tblsp flour or corn starch
3 tblsp olive or canola oil

In a glass or non-reactive bowl mix beef, 3 tblsp soy sauce, juice of 1 lemon and flour. Let sit for 15 minutes.  Heat oil in a deep saute or frying pan.  Add the onions and season with salt and pepper.  Fry onions until translucent, approximately 5 minutes.  Remove from the pan and set aside.  Add the sliced beef in batches to allow it to brown. Remove and set aside, continue cooking until all the beef has been browned.  Return all the beef back into the pan and add the onions.  Add the  remaining soy sauce, the juice of the last 2 lemons and water.  Allow to slowly boil.  Season with lots of pepper or to taste.  Add the oyster sauce and continue slow boiling for another 5 minutes. If the soup is too tangy, add 2-3 tablespoon of water and continue to slow boil for another 2-3 minutes.  Taste and season with salt and pepper if needed.  Serve hot over rice.