Boil the bones with the water. Add in the optional vegetables if you want. It gives aroma.

Let it boil for 3 minutes then simmer it.

Simmer the chicken with medium to low heat for 1 hour or longer. The longer you cook, the stock is fattier.

The stock will be fattier with slowly simmering method.

After 1 hour, switch off the heat. Remove the bones and strain the stock out.