In a kadai,add coriander powder,chilly powder,kasmiri chilly powder,turmeric powder,fenugreek seed powder and kept it in a low flame until these powder get light brown colour. Then, grind these powder in a mixi and kept aside.
Add ginger,shallots,few curry leaves and kudom puli and just crush(chathakkuka) it in a bowl.
Add grinded powder,crushed things,the water containing the extract of kodampuli and salt as reqd in a meen chatti.
When the water starts boiling,check the level of sourness. Add the fish pieces & enough water to cover the pieces & cover it with a lid.
COOK IN ALOW FLAME.STIR LIGHTLY (to avoid breaking the fish)IN BETWEEN,OR JUST SHAKE THE CHATTY (BE CAREFUL).
When the pieces are almost done,uncover the chatty and cook till the fish curry gravy get thickened. At last add coconut oil and curry leaves above the fish curry and put down the flame.