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 bowl, combine ground pork, 3 whole eggs, chopped mushrooms, glass noodles, onion, scallions, garlic, fish sauce, soy sauce, sugar, black pepper, and salt. Mix thoroughly until completely incorporated and sticky.
03 - Lightly grease a heatproof dish or loaf pan with oil. Transfer the pork mixture to the dish and level the surface with a spatula.
04 - Place the dish in a steamer over simmering water. Cover and steam for 25-30 minutes, or until the meatloaf is firm and set.
05 - Beat the remaining egg yolk. After 25 minutes of steaming, carefully spread the yolk evenly over the top of the meatloaf. Cover and steam for an additional 5-7 minutes until the yolk is glossy and fully set.
06 - Remove from heat and let cool slightly for 5 minutes. Slice and serve warm with jasmine rice and pickled vegetables, or use as a filling for banh mi.