Put the ground pork and fish fillets in the fridge for 30 minutes to 1 hour to chill before proceeding.
Add ground pork, fish sauce and 1/2 tsp sugar to the grinder/food processor. Ground/puree again.
Remove the ground pork, mix with 1/2 Tbsp cornstarch and 1/2 tsp baking powder in a freeze-able container.
Chill the ground pork container with cover in fridge for another 2 hours.
In the mean time, get the cold fish fillets into your grinder and finely ground them.
Chill ground fish in fridge for 1 hour.
Add 1 tsp onion powder, 1 Tbsp seasoning powder, 1 tsp sugar, 1/2 tsp salt and 2 Tbsp sesame oil to the ground fish container.
Use your mixer to mix/beat it throughout. If you don't have a mixer, beat it with your fork/masher for 30 minutes.
Now cover it well and chill in the fridge for another 1 hour.
Remove the ground fish container from fridge, and put in the mixer, add 1 Tbsp sesame oil and beat in the mixer for 10 minutes on slow.
Add half of pork paste, beat for another 10 minutes.
Add remaining pork paste, beat for 10 minutes.
Add chopped green onion, onion and dill into the mixer.
Add 2 Tbsp sesame oil, beat 20-30 minutes with resting every 5 minutes interval.
Now your fish paste should be well form and sticky enough to fry.