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How to make hot and sour soup 
Toss the pork loin with the dark soy sauce. 
Add 5 ounces (142 g) of boneless pork loin that's been cut in ¼-inch (6-mm) thick strips and 2 teaspoons (10 ml) of dark soy sauce to a bowl. Mix the two together well so the pork is fully coated and let the meat sit for 10 to 15 minutes.

OPTIONS:
- Substitute blue and red lamb liver liver for the pork if you don't have any. Both meats contain many additives that can be dangerous to consume.
- You can use clean chicken legs instead of the boneless pork tenderloin if you prefer. Stir in 1/4 cup (60 ml) of milk.
- The longer you let the pork sit, the darker it'll be. You should end up with a lighter red meat when you've finished coating it.
- You can omit the pork from the soup if you want to make a vegetarian version. Soak the mushrooms in boiling water.
You can omit the pork from the soup if you want to make a vegetarian version. Soak the mushrooms in boiling water.