Use boneless, skinless chicken breasts or thighs to make this easy and flavorful soup. Fresh lime juice and plenty of fresh herbs help temper the heat of the curry.
For an authentic depth of flavor, ensure you 'bloom' the red curry paste with garlic and ginger, stirring constantly until deeply fragrant and dark red. This process unlocks its full aromatic potential. Bruising the lemongrass stalk before adding it helps release its essential oils and distinct citrusy aroma into the broth; remember to remove it before serving as it's fibrous. Pay close attention to chicken cooking times; breasts cook much faster than thighs, and overcooked chicken can be dry and stringy. To maintain optimal noodle texture, only add them to the soup immediately before serving, or directly into individual bowls, to prevent them from becoming mushy. The fresh herbs and lime juice are critical for brightening the soup and tempering the curry's richness and heat; add them off the heat to preserve their vibrant flavor and color. Consider adding some thinly sliced bell peppers or bamboo shoots during the last 5 minutes of simmering for added texture and nutrition.