I like Pat Chun Sweetened black vinegar to make this Chinese pork/ pig knuckles ginger vinegar stew recipe because it is already sweetened and has a better taste. I have tried other brands of black vinegar like Pearl River Bridge and Koon Chun. But, they are very sour and need to add a lot of sugar. Therefore, I recommend using Pat Chun brand sweetened black vinegar and not mixing with other black vinegar.