Traditional kerala style fish curry

Ingredients

Ingredients :

• 2 lbs. cat fish, cut into 2" pieces lengthwise
• 2 tsp red chili powder
• 1/2 tsp black pepper powder
• 1/2 tsp turmeric powder
• 1/2 cup Shallot , chopped lengthwise
• 1/4 cup onion, chopped
• 2 tsp ginger , minced
• 24 garlic cloves (small), Use less in no. if using larger cloves
• 4 green chilies, slit lengthwise
• 2 tsp vinegar / lemon juice
• Salt, to taste
• Ingredients for seasoning (tadka in Indian terms)
• 1 tsp mustard seeds
• 1 tbsp shallot , chopped
• 6 garlic cloves (small) , minced ; Use less in no.if using larger cloves
• 4 whole red chilies, chopped into small pieces
• 5-6 curry leaves
• 2 tbsp Oil