Black Vinegar Sweet & Sour Pork | wa's Kitchen

We call this "subuta" in japanese (vinegar pork) and my grandmother used to make it often when we were kids. Now this is a chinese version and the black vinegar taste makes it really stand out. Please give it a try!
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Ingredients :
- 1/2 onion
- 200g pork
- 1 tbsp cooking sake or white wine
- a dash of salt
- some ginger
For the sauce :
- 1.5 tbsp black vinegar (chinkiang vinegar)
- 1 tbsp soy sauce
- 2 tbsp sugar
- 1 tbsp water
- 1/2 tsp potato starch
- 1 tbsp water
- some sesame oil (optional)