Make the stock by frying 50 prawn heads in a wok with some oil and a handful of white peppercorns. Fry until you get a nice aroma and the prawn heads turn bright red.
Transfer the prawn heads and the accompanying oil into a slow cooker. You may wish to add chicken bones or chicken carcass for more chicken flavour as well. Fill the slow cooker with hot water and let it slow cook for 6 hours.
After 6 hours, strain the stock and add 8 ladles of the stock to a pot. Bring the stock to a boil. Add 150g chicken breast and poach for 20 minutes. Remove the chicken breast after 20 minutes and shred the chicken into thin strips.