For the simmering sauce:
1 cup light soy sauce
1 cup water
1 tablespoon sugar
knob of fresh ginger the size of a small walnut, peeled and smashed
2 cloves garlic, peeled and left whole
2 tablespoons 5-spice powder or mixed spices, wrapped in a square of cheesecloth (muslin)
1 lb beef shin (gravy beef), in one whole round piece with no cuts
1. Bring all the ingredients for the simmering sauce to a boil in a pot large enough to hold the piece of beef. Place the beef in the pot, and bring the sauce back to boil. Reduce the heat to low, and simmer for 2 hours.
2. Remove the beef and chill in the refrigerator for at least several hours, or preferably overnight.
3. Thinly slice and serve as a cold appetizer.