1Combine ground pork, green onion, ginger, garlic, soy sauce, sesame oil, white pepper, rice vinegar, and cornstarch; mix until combined, then form into small meatballs and set aside.
2Heat sesame oil in a large pot and sauté onion, smashed garlic, sliced ginger, and lemongrass paste until fragrant.
3Pour in chicken broth and season with soy sauce, rice vinegar, sesame oil, white pepper, and salt; bring to a boil, then simmer for 20 minutes.
4Strain the broth to remove aromatics, then return it to the pot.
5Add meatballs and simmer for 10-15 minutes until cooked through.
6Gently drop in wonton wrappers in batches until they float; add bok choy and cook for 2-3 minutes.
7Taste and adjust seasoning with soy sauce, rice vinegar, chili oil, or fish sauce.
8Serve and garnish with chili oil and green onions.