After adding salt: Salt can accelerate the solidification of the protein contained in the meat, which makes the meat not easy to be cooked, so the salt can't be added too early.

Put hawthorn: when stewing meat, put a few slices of dried hawthorn can make the meat rotten faster.

Heating water: If you need to add water in the middle of the stew, you need to heat the water, adding cold water will make the meat hard.