Prepare all dried ingredients
Place chicken carcass straight into Pressure Cooker ( If you wish, you may roast the bones first for extra flavour). Compacting down the chicken so they fit tightly.
Place all dry ingredients on top of chicken. Pour in Apple cider vinegar.
Pour the water into the pressure cooker until all the chicken is submerged under water.
Set Pressure cooker to Manual pressure on high. Set time for 1 hour 30 minutes.
Allow the pressure cooker to natural release after the cooking time is complete.
Once you remove the lid, strain the stock into a large saucepan using a fine sieve. I typically reserve the mushroom and dried scallops and discard the bones and remaining ingredients. The shiitake mushroom and dried scallops can be returned to stock and eaten as part of a soup dish later on.
Prepare a large cold water bath. Place the saucepan of stock in water bath to reduce temperature rapidly.
Once the stock is cooled to an adequate temperature. Store stock in the refrigerator using jars, containers or pitchers. Consume within the week. Alternatively, freeze some stock in freezer safe soup containers. Frozen soup will store for up to a month.