Put the fish fillet in a food processor and process until smooth for about 5 to 10 seconds. Take out the fish in a medium bowl.
Add he Thai red curry paste, lime leaves, fish sauce, oyster sauce, rice vinegar and salt. Mix well to make a homogeneous mixture.
Now add the cornflour, one tablespoon at a time giving a good mix after each addition. You may not need all the cornflour as mentioned above, but just enough to make a thick mixture which is not too watery; else you won’t be able to make balls out of it.
Make equal sized balls from the fish mixture and set aside on a plate.
Heat oil in a shallow frying pan and when the oil is hot enough, place the fish cakes carefully onto the frying pan.
Fry the fish cakes on medium-low heat for 6 to 8 minutes and then flip it over and cook for another 6 to 8 minutes. The outside will be golden brown in color.
Serve hot with the Thai sweet chilli sauce!
Recipe by Flavor Quotient at https://flavorquotient.com/2015/06/thai-fish-cake/