In a bowl, mix dark soy sauce, chili sauce, white vinegar, tomato ketchup, salt, black pepper powder, corn starch & water. Whisk well so that there are no lumps.
In a sauce pan, heat up 2 tbsp of oil. Do not make it too hot. Add in ginger, garlic and thai green chili. Mix well and cook it on low/med heat for 2-4 minutes. It will look dense at first then as you cook more, it will start to get light and fluffy. This step is to ensure the slow cooking of ginger & garlic so that they do not get burn while still start to hold some crunch and golden brown color.
Add in cilantro stems and white part of scallions. Mix well and cook for 30-60 seconds.
Add in the sauce mix, stir it constantly while you cook it on medium heat. It will deepen the color and thicken up.
Add in baked crispy tofu and mix well to coat each pieces with the sauce. Sprinkle some cilantro and green part of the scallions.
Simply serve it on the bed of cabbage slaw with side of steamed rice and choice of beverage.