I suggest using Seerfish or Tuna. People from northern Kerala calls it Malabar fish curry / Kozhikodan fish curry, while those towards the Travancore region, calls it Kottayam style fish curry and some calls it simply Meen Mulakittath
ChettinadFishFry (Spicy SeerFish/Neymeen/KingFish/ VanjaraMeenFryTamilNadu Style). Ingredients For Okra/Ladies Finger/Vendakka Pepper Fry Kerala (Indian) Style Method For Okra/Ladies Finger/Vendakka Pepper Fry Kerala (Indian) Style • Wash and dry okra/ladies finger using a towel or kitchen tissue
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Karnataka Style Fishfry recipeNethili Fish/ Nethilli Meen/ Anchovies are a small variety of fish that are quite popular down South (India), one of the finger licking fish starters would me Nethilli Meen Varuval in most restaurants