Cut the pork fat into small pieces and marinate them with brown sugar. Set aside.
Put the ground pork and pork paste into a large mixing bowl.Season them with sugar, fish sauce, ground pepper, salt, annatto oil, garlic powder, five-spice powder, Mei Kuei Lu wine, oyster sauce, and tapioca flour. Mix well. Add the marinated pork fat pieces to the bowl and mix well. Refrigerate the pork mixture for 2 hours.
Mix the Mei Kuei Lu wine, cooking oil, and honey in a bowl until well combined.
Spray a little cooking on an aluminum foil, then place the mixture on one end of the foil.Adjust the amount of pork mixture in one sausage based on your preference. Then, roll the foil to shape the Nem Nuong. Spray a thin layer of cooking oil over the sausages.
Preheat the oven to 390°F for about 15 minutes.
Grill the sausages at 390°F for 15 minutes.
Take the sausages out and brush them with the basting sauce on all sides.
Grill them at the same temperature for another 10 minutes.
Enjoy while they're still hot for the best flavor.