Start the Broth: Rinse the pork shoulder and spare ribs under hot running water to remove any blood and impurities before making the broth. Place the meat in a large 12 to 16-quart stockpot, add 8 litres of cold water, and bring to a rolling boil over high heat. Using a skimming ladle, continuously skim off any foam or impurities that rise to the surface until the broth is completely clear.
Simmer the Broth: Add the fish sauce, rock sugar, diced onions, and salt to the pot. Stir to combine. Reduce the heat to medium-low and simmer uncovered for 45 minutes. Add the cubed daikon radish (and 2 cups of water if the broth has evaporated significantly). Simmer for 30 more minutes, skimming any remaining foam as needed.
Mix the Wonton Filling: While the broth simmers, make the dumplings. In a large bowl, thoroughly mix and knead together the ground pork, green onions, garlic, white sugar, oyster sauce, sesame oil, salt, and black pepper.
Fold the Dumplings: Place a wonton wrapper in your palm, corner facing up. Place a 1-inch scoop of meat in the center. Fold the bottom corner up and slightly to the right to create a staggered triangle. Place your thumbs on either side of the meat filling and firmly pinch/crimp the wrapper inward to create a pleated, sealed dumpling. Repeat, keeping finished wontons covered with a damp tea towel.
Set up the Blanching Station: Set out 8 large soup bowls. Place a 1-cup portion of loosened (uncooked) egg noodles into each bowl. Bring a large pot of water to a boil.
Blanch and Layer: Use a mesh strainer and blanch the bok choy wedges for 2 minutes. Set aside. Blanch the shrimp for 1-2 minutes, until cooked and pink in colour (Note: cooking times vary by shrimp size), then set aside. In the same strainer, blanch a portion of noodles for 1-2 minutes. Rinse briefly under cold water and return it to the bowl. Repeat this for each bowl. Next, blanch 5-6 wontons for 2-3 minutes until cooked; place on top of the noodles. Add one wedge of blanched bok choy to each bowl and two to three cooked shrimp. Final Assembly: Add three to four slices of Char Siu pork to each bowl. Pour the hot pork broth through a clean mesh strainer directly into the bowls to cover the ingredients. Garnish with bean sprouts, cilantro, and green onions. Serve immediately with lime wedges, Sriracha, and soy sauce! If you have fried shallots on hand, sprinkle some on there for extra crispy flavour.