Place fillets in a brine bowl of tap water, 2 tbsp salt and 1/2 tbsp sugar for 12 mins. aggitate and turn every few mins.
Tamp dry the fillets and coat each side with both sugar and salt. A few pinches of each on each side will work.
Heat the frying pan up with oil in it and place the fillets skin side down first and cook for 3 to 4 mins each side.
The sugar burns a bit and gives a nice blackened, sweet crunch to it..