Sauté Onions and Aromatics: In the same pan, add the sliced onions and sauté until they turn translucent.
Add Chilies, Ginger, and Garlic: Add the slit green chilies, julienned ginger, and sliced garlic. Sauté for another 2-3 minutes until fragrant.
Add Tomatoes and Spices: Add the chopped tomatoes, turmeric powder, black pepper powder, and curry leaves. Cook until the tomatoes soften and the spices are well incorporated.
Add Thin Coconut Milk: Pour in the thin coconut milk and bring it to a gentle boil. Let it simmer for about 5 minutes.
Add Fish and Thick Coconut Milk: Carefully add the fried fish pieces to the curry. Pour in the thick coconut milk and gently stir to combine. Let it simmer for another 5 minutes, allowing the flavors to meld and the fish to absorb the creamy sauce.
Season and Garnish: Adjust the salt to taste. Add a squeeze of lemon juice for a hint of tanginess. Garnish with fresh coriander leaves.