01 - Soak dried wood ear mushrooms and glass noodles in warm water for 10 minutes. Drain thoroughly and finely chop both ingredients.
02 - In a large mixing bowl, combine ground pork, 3 whole eggs, chopped mushrooms, glass noodles, diced onion, chopped scallions, minced garlic, fish sauce, soy sauce, sugar, black pepper, and salt. Mix thoroughly by hand or with a spatula until all ingredients are evenly distributed and the mixture becomes sticky and well-incorporated.
03 - Lightly grease a heatproof dish or loaf pan with oil. Pour the pork mixture into the dish and smooth the top surface with a spatula to ensure even thickness.
04 - Place the dish in a steamer over simmering water. Cover tightly with a lid and steam for 25-30 minutes, or until the meatloaf is set and firm to the touch.
05 - Beat the reserved egg yolk in a small bowl. After the initial steaming time, carefully uncover the steamer and spread the beaten yolk evenly over the top of the meatloaf. Cover and steam for an additional 5-7 minutes, until the yolk is fully set and glossy.
06 - Remove the dish from the steamer and let cool for 5-10 minutes before slicing. Serve warm with jasmine rice and pickled vegetables, or use as a filling for banh mi sandwiches.