When the colour turns brighter set it aside along with the onion.
In the same oil add the coconut pieces till it becomes light brown.
Add garlic and saute for 2 min and add the chillie powder.
:-Make sure that the pan is on a low flame so that the powder will not get burnt saute it for another 2-3 min.
Add the cooked prawns and saute it for 5 minutes stirring occasionally.
Add freshly ground pepper powder and saute for another 1 minute.