Nuea Pad Nam Man Hoy (Stir Fried Beef in Oyster Sauce)

This is a simple stir fry dish: nam man hoy is oyster sauce.

Put a little oil in a wok and sauté a couple of tablespoons of garlic, and a couple of tablespoons of shallots (purple onions).
Add about two pounds of beef, cut into bite sized pieces.
You then add a sauce consisting of:
1 cup of oyster sauce
3 tablespoons of Worcestershire sauce
1 tablespoon fish sauce
Stir it until it begins to simmer.
If it is a little dry, add a little water.
Cover and leave to simmer for five minutes.
Then add about a tablespoon of chili powder (prik phom), fresh black pepper, a tablespoon of fresh ground ginger , and some chopped onions, and stir until heated through.