Cut the pork into bite-size pieces, 1 x 1 inch. If you use dry chestnuts, place them in a saucepan with boiling water and cook for 3 minutes. Mix the broth, soy sauce and coloring. Heat the oil over strong flame in a medium saucepan. Add the pork and sauté all around for 3-4 minutes. Add the dry or fresh chestnuts and stir with the pork for another 3 - 4 minutes. Add the sauce mix and when it boils, reduce the flame and leave over low flame for 10 minutes, stirring every now and then. Cover and cook over low flame for 1 hour. Credit: Original recipe from this Chinese Food website.