Heat oil in a kadai or a pan.
Add mustard seeds & when they start to splutter, add the dry chillies, curry leaves & sliced pearl onions and saute for a few seconds.
Add the chopped garlic, ginger & green chillies.
When the raw flavor of garlic & ginger goes, add the chopped onions.
Saute, till the onions start being transparent.
Add the turmeric & red chilly powder & saute for a few seconds.
Add the pounded tuna flakes to this and mix well to fry for 2 - 3 mins.
Add the black pepper powder & grated coconut with salt and mix well.
Add kodam puli & sprinkle about 1/2 cup of water & close the pan with a lid.
Let it cook for 2 - 3 mins on low flame.
Remove the lid, add a pinch of garam masala and fry till all the water evaporates.
:- Serves nice with chappaties, rice & even as stuffing for sandwiches.