1, water stew with ceramic, so that the stewed nutrition is not lost. Directly stewed after stewing only a little bit of it, nutritious soup are absorbed by it. So the water is good.

2, stewing time, direct stewing is better, because direct stewing requires less time, and fewer steps, but direct stewing ingredients nutrients are easily destroyed. Water stew is suitable for bird's nest, cordyceps, fish glue and other precious tonic stew, direct stew is suitable for bones, beans, mushrooms and other more common ingredients stew. So it's good to stew in alternate water.