After the fire boils, simmer for 3 hours. The specific method is as follows. First, prepare materials:

Bovine bone: 1000g, red dates: 6, longan, Lycium barbarum, Codonopsis pilosula: 15g each, angelica sinensis: 3 pieces, clear water: appropriate amount, salt: appropriate amount, chicken essence: appropriate amount.

1. Wash and cut beef bones, and then soak them in clear water for more than 2 hours.

2. Pour a proper amount of water into the pot, then put the beef bones in the fire for 5 minutes, take them out and rinse them off.

3, another pot, put all the materials, add the right amount of water, after the fire boils, turn to low heat for 3 hours.

4. Add proper amount of salt and chicken essence to taste before cooking.