this dish is a confinement food for ladies who have given birth, but of course, can be eaten whenever the whim arise black sugar can be replaced by brown sugar....black sugar as the name suggest, is really black. Here's the recipe from a book " Confinement Food " 1 pig's trotter - abt 1 kg. 1 kg old ginger, skinned and smashed lightly 4 tbsp sesame oil 800 ml black vinegar 1.5 litres water 300 g - 400 g brown sugar ( adjust sweetness to your liking ) hardboiled eggs - optional Method ; Clean and pluck hair of trotters. Cut into big chunks. Blanch trotters, drain. Heat sesame oil and fry ginger till fragrant. Dish out ginger and put into a clay pot. Add vinegar, water and brown sugar. Bring to a boil and simmer for 20 - 30 mins or till ginger is soft. Add pig's trotter pieces and continue to simmer till meat is tender, about 2 hours. Add hardboiled eggs half an hour before serving. Chinese believe black vinegar purifies the blood. old ginger drives out wind from the body brown / black sugar checks the dampness in the body. Notes : original recipe use 2 pig's trotters. 1/2 cup of sesame oil and 600 g sugar.