Maharashtrian Kalvan 

Kalvan is another word for curry in the Indian language of Marathi. "Kalvan Bhaat" or fish curry and rice is very common and popular in the state of Maharashtra. 

Made with only a few ingredients it is the traditional way to make a quick fish curry. This curry turns out especially good when you use tamarind pulp. Dried Mango Powder or tomato puree may be used instead, but the taste will change drastically. Use the fish you like. Salmon has a very strong flavor and some people do not like it for this curry. Fish like cod or, orange roughy are great. 

2 lbs Fish
2-3 whole Garlic cloves, crushed slightly
1 Green Chilies
4 tablespoons Tamarind paste
2 teaspoons Garlic paste
2 teaspoons Red Chili Powder
1/2 teaspoon Turmeric
 Salt - to taste
1/2 cup Coconut Milk
1 Green Chili slit lengthwise and  A pinch of asasfoetida
3 tablespoons Oil

Marinate fish in the garlic paste, red chili powder, turmeric, tamarind paste and salt for 10 minutes. Heat the oil in a pot. Add the asafoetida, garlic cloves and green chili. Add the marinated fish. Cook the fish until it is almost cooked. Now add the coconut milk. Bring the mixture to one boil. Simmer for 3-4 minutes. Garnish with freshly chopped cilantro leaves. Serve hot with plain rice.