1. The old duck is chopped into pieces and cleaned.
2. Boil a pot under cold water and set aside.
3. After blanching, remove and drain the water.
4. Warm the oil in a pan.
5. Add ginger, onion, garlic, dried chili pepper and saute.
6. Put two kinds of Pixian Douban and homemade spicy Douban paste. Stir-fry until fragrant.
7. Add the duck cubes, sprinkle a few rock candy, and continue to stir fry.
8. Stir fry until the duck skin shrinks.
9. Add an appropriate amount of boiling water all at once and bring to a boil.
10. Turn to low heat, cover, and simmer for about 50 minutes.
11. After simmering, turn off the heat, taste the saltiness and add salt as appropriate.
