1. Bring chilis to a boil in water and let steep for at least 5 minutes.
2. Grind the chilis, water and garlic to a paste. Add the spices and lemon juice and mix to combine. Set aside.
3. Fry the cod fillets in 1 tablespoon olive oil for 4 to 5 minutes on each side. Set aside.
4. In a large, heavy-bottomed pot, saute onion in 1 tablespoon oil until translucent. Add chili paste and cook over low heat for about 10 minutes.
5. Stir in coconut milk and 1/2 cup water. Season to taste with extra cayenne pepper and lemon juice.
6. Add the cooked fish and continue cooking for 10 more minutes. Â Garnish with fresh cilantro.