To make the dipping sauce, rinse the sweet rice in a fine mesh strainer until the water runs clear. In a large pot, combine the sweet rice, pork belly or shoulder, pork liver, fish sauce, annatto oil, garlic, sugar, and water.
Bring the mixture to a boil over high heat, then reduce the heat to low and simmer for 1-2 hours (until the rice has disintegrated and the sauce is thick).
Strain the sauce through a fine mesh strainer, discarding the solids. Set aside.
In a large bowl, mix the ground pork, sugar, fish sauce, soy sauce, minced garlic, black pepper, and salt until combined.
Preheat a grill or grill pan to medium-high heat. Form the pork mixture into small sausages and grill for 8-10 minutes, turning occasionally, until fully cooked.
Let them cool for a few minutes before slicing them into thin pieces.
Take a wonton wrapper and place a sprig of spring onion in the center. Fold the wrapper in half diagonally to form a triangle. Press the edges to seal. Repeat with the remaining wonton wrappers and spring onions.
Fry in the air fryer at 360°F for 15 minutes or 3-4 minutes in oil. Set aside.
Fill a shallow dish with water. Dip one rice paper wrapper into the water and let it soak for 10-15 sec. Place the soaked rice paper wrapper on a flat surface.
Add a few pieces of sliced pork sausage, vermicelli noodles, a crispy wonton, lettuce, fresh herbs, julienned carrots, and cucumbers in the center.
Fold the sides of the rice paper wrapper towards the center, then roll the wrapper tightly from the bottom up. Repeat with the remaining ingredients.
Serve the pork spring rolls with the dipping sauce on the side. Enjoy!