Heat sesame oil in a large skillet over medium high heat. When the oil is hot, add the chopped garlic and ginger and cook for 1-2 minutes, until fragrant. Add the ground pork and break up using a wooden spoon. Season with a large pinch of salt and let cook, without stirring for about 5 minutes, until the bottom of the pork is deeply browned. Stir and continue to cook for 2-3 minutes more, until all of the pork is cooked through. Stir in the rice wine vinegar, soy sauce, and Sui Mi Ya Cai and cook 1-2 minutes more. Remove from heat and set aside.
While the pork is cooking, make the sauce by combining all ingredients in a large bowl and whisking until smooth.
Meanwhile, bring a large pot of water to a boil. Add the bok choy and cook for 1-2 minutes, just until bright green and softened. Remove from the water using a slotted spoon and set aside. Bring the water back to a boil and cook noodles according to package instructions. Before draining, save 1/2 cup of the boiling water.
Add that 1/2 cup of noodle water to the sauce and stir just to combine.
To serve, place 1-2 tsp chili oil (depending on spice preference) in the bottom of a bowl. Spoon in a ladle of sauce, followed by a serving of noodles. Toss gently to coat. Spoon pork topping and bok choy on top of the noodles and garnish with green onions. Serve immediately.