Heat sesame oil on a low heat, add onion, garlic and ginger until onion is soft and the mixture is fragrant.
Add chicken breast and brown, then add pork belly, roast beef, shrimp, chicken stock, brown sugar and soy sauce. Simmer for 5 minutes, add wontons and noodles, and cook until chicken is cooked through and wontons are hot in the middle.
Add fish sauce and rice wine vinegar, then taste. If it’s too sweet, add some soy sauce or fish sauce to salty it up. If it’s too tangy, add a bit more sugar.
Serve with coriander.