Process the hake, fish sauce, sugar, garlic, ginger, coriander, curry paste, zest and chilli in a food processor for +- 20 seconds.
Add the corn flour and egg and blitz for another 10 seconds. Do not over process.
Spoon mixture into a mixing bowl and add the spring onions. Mix until evenly combined.
Cover and rest in the fridge for at least 30 minutes.
Use wet hands and shape 2 tablespoons of mixture per patty – flatten them slightly for even cooking.
Heat a large nonstick frying pan with 3 cm of oil. Fry the patties over a moderately high heat until golden and cooked through (about 3-4 minutes a side).
Drain excess oil on paper towel.
Serve hot or room temperature with dipping sauces and steamed greens. Garnish with coriander.