Heat the cooking oil and fry finely ground paste until fragrant.
Add the tamarind juice and bring to a boil. Simmer for 4 minutes.
Increase the heat and add fish, kaffir lime leaves, sugar and salt. Cook for 4 minutes.
Add lady's fingers and cooked for another 5 minutes until the fish is done and lady's fingers are tender.
Finely Ground Paste
If using pestle & mortar, add the ingredients bit by bit and pound until it become fine paste. Might take more than 15 minutes.
If using food processor, add all the ingredients and grind until it become fine paste.
If using blender, add all the ingredients and the oil from the main ingredient list to help it grind (because blender needs liquid to blend). Then you do not need more oil when cooking the paste.
Recipe by at https://justasdelish.com/gerang-asam-nyonya-cuisine/