This is a traditional Malay recipe from my sister-in-law, Molly. You can substitute the prawns for fish or chicken. Note that if using chicken, it will take a longer time to cook.
Peel and devein the prawns. Reserve the heads and shells. Rinse the prawns and set aside.
Place the prawn heads and shells in a pot. Add the boiling water and simmer for 15 minutes. This will be the stock for the dish. Strain the stock and discard the heads and shells (see Note).