```markdown
Ingredients:
- 100g donkey-hide gelatin (阿胶)
- 100g rock sugar
- 500ml water
- 20g glutinous rice flour
Instructions:
1. Soak the donkey-hide gelatin in water for at least 24 hours until it softens.
2. Cut the softened donkey-hide gelatin into small pieces and put them in a pot with 500ml of water.
3. Cook over low heat until the gelatin completely dissolves.
4. Add rock sugar to the pot and stir until it dissolves.
5. Mix the glutinous rice flour with a little water to make a slurry, then slowly pour it into the pot while stirring continuously.
6. Keep stirring until the mixture thickens and becomes sticky.
7. Pour the mixture into a mold and let it cool and set.
8. Once set, cut the mixture into small pieces to serve as 阿胶糕 (donkey-hide gelatin cake).
Enjoy your homemade 阿胶糕!
```
