Chinese Beef with Mushrooms and Onions

This is another super simple and delicious dish.  Enjoy!

Ingredients:
For marinade:
-4 garlic cloves, minced
-4 Tbs oyster sauce
-4 Tbs soy sauce
-2 tsp sugar
-1 tsp salt
-1/2 tsp pepper
-1 cup water
-4 tsp cornstarch
Remaining ingredients:
-1 1/2 lbs flank or round steak, thinly sliced
-8 oz fresh sliced mushrooms
-2 large onions, thinly sliced
-4 Tbs oil, divided
Directions:
In a large bowl, mix all marinade ingredients.  Place sliced beef in marinade.  Cover and let sit for 30 minutes.
Heat 2 Tbs oil in large skillet.  Remove beef from marinade with slotted spoon and place in hot oil.  Do NOT discard marinade.  Cook steak all the way through.  Remove onto plate.
Pour remaining 2 Tbs oil in skillet.  Add mushrooms and onions.  Cook for 3-4 minutes, or until nice and soft.  Add marinade liquid.  Bring to a boil and cook for 30 more seconds.  Return stake to pan and simmer until heated through.  Serve on top of rice.  Enjoy!
Recipe adapted from here.