The rice cake is burnt. The black stuff in the Beijing rice dumplings is caused by the rice dumplings being burnt. All you need to do is remove the black marks left behind. Edit the voice of the nutrition facts of the rice dumplings. Millet rice dumplings contain carbohydrates, fat, protein, vitamin A, B vitamins, calcium, potassium, and iron. , magnesium and other minerals, rich in nutrients, crispy and delicious.