Add oil to a large soup pot over medium heat. When hot, cook the green onion, carrots, celery, and daikon for 3 minutes or until they start to sweat.
Add broth and bring to a simmer, and cook for 5 minutes.
Meanwhile, mix the pork, garlic, ginger, and salt in a medium mixing bowl. When soup has simmered for the 5 minutes, drop the meat mixture into the simmering broth in 2-Tbsp sized meatballs.