1. Boil the spine in boiling water to remove blood.
2. Shell the chestnuts.
3. Cut corn into sections.
4. Put them all into the pressure cooker.
5. Put in soy sauce.
6. Add cooking wine.
7. Add vinegar.
8. Add five-spice powder.
9. Add salt.
10. Add pepper and aniseed.
11. Add green onions and ginger.
12. Pour a large bowl of water and press it to soften it.
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