Black soy sauce is darker, thicker and sweeter than ordinary soy sauce. You can find it in Chinese/Oriental supermarkets.
Heavenly delicious!!! One of a few dishes where sweetness isn't overpowering. Both marinade and sauce ingredients well balanced, the mandarins worked absolutely perfectly making the dish sweet-sour-jam consistence sauce with meat. I diced my pork into large cubes and therefore the marinade penetrated it even deeper and frying time was obviously reduced, too. Instead of orange zest I added 2 teaspoons of orange jam and I reduced the marinade on low heat to use it as additional sauce. Served with stir fry rice. Definitely a very good choice. - 22 Aug 2017