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Add chicken, water, lemongrass, garlic, and onion to a large pot. Bring to a boil, then reduce heat to simmer for 45–60 minutes until the chicken is tender. Remove the chicken, shred it, and keep the broth warm.
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Heat oil in a skillet over medium heat. Cook ground meat until lightly browned, then stir in chili paste and shrimp paste. Cook 2–3 minutes until fragrant.
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Add the cooked sauce to the broth, then return shredded chicken. Season with salt and fermented fish sauce to taste. Simmer for another 5–10 minutes.
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Cook rice noodles according to package instructions and drain.
Assemble and Serve:
Place noodles in bowls, ladle the hot broth and chicken over them, and top with fresh herbs, cabbage, lime, and chilies. Serve immediately.