Method:

1. Heat oil in a heavy large saucepan over medium heat. Add shallots, garlic and ginger. Reduce heat to medium-low. Stir in curry paste, Add coconut milk and fish sauce; bring broth to boil.
2. Cook snow peas in boiling water. Add sweet potato and cook until tender. Using the strainer, remove sweet potato from pot and rinse under cold water to cool. Bring water in same pot back to boil and cook noodles until just tender but still firm to bite. Drain; rinse under cold water to cool.
3. Bring broth to simmer. Add chicken; simmer until chicken is cooked through. Stir in sweet potato.
4. Heat noodles in a microwave in 30-second intervals to rewarm. Divide noodles among bowls. Divide snow peas and hot soup among bowls. Scatter red onion and chiles over soup. Garnish with lime wedges and serve.