Cut the beef into small pieces and place in a food processor with minced shallots and garlic, 1 teaspoon seasoning powder, 1 tablespoon oyster sauce, and 1/2 teaspoon black pepper. Blend until smooth, then add the ground pork, 1 teaspoon sugar, 1/2 teaspoon seasoning powder, and 1/2 teaspoon black pepper. Blend everything together until well mixed, then let the mixture rest for about 10 minutes to absorb the flavors.

Wash the betel leaves and let them dry. Set aside the large, evenly sized leaves for wrapping. Finely chop the remaining leaves to mix into the meat. Add chopped green onions for extra flavor.

Lay each clean, dry betel leaf on a large plate. Place a spoonful of the meat mixture on each leaf, then roll up the leaf to wrap the filling. Repeat until all the meat and leaves are used.

Heat a skillet over the stove and add cooking oil. When the oil is hot, add the beef rolls. Cook over low heat so the beef wrapped in betel leaves cooks evenly.