How to extract sour jujube seed?

Extraction method:

1. Sun-dry the sour jujubes until they are half-dry, then soak them in a water tank for 4-5 days. This softens the flesh, allowing it to loosen. Remove the flesh and take out the jujube seeds.
2. Dry the seeds and place them in a specialized grinder for milling. After grinding, use a sieve to separate the kernels from the broken husks. Then, rinse the kernels in a water tank. The lighter seeds will float on the surface, while the heavier husks will sink. Stir with a fence to scoop out the kernels.

Sun-dry the kernels to obtain the sour jujube seeds.