Heat the sesame oil and neutral oil in a large soup pot over medium heat.
Add the ground pork or chicken and cook until browned, breaking it up as it cooks.
Stir in the onion, garlic, ginger, and half of the green onions. Cook for 2 to 3 minutes, until fragrant and softened.
Add the shredded cabbage and carrots. Stir well and cook for another 3 to 4 minutes, just until the vegetables start to soften.
Pour in the chicken broth, soy sauce, rice vinegar, sriracha if using, black pepper, and salt.
Bring the soup to a gentle simmer and cook for about 10 to 12 minutes, until the cabbage is tender but still has a little texture.
Taste and adjust the seasoning with more soy sauce, salt, or vinegar if needed.
Ladle into bowls and top with the remaining green onions, sesame seeds, or crispy wonton strips.