Sweet potato, lemongrass & coconut soup

Ingredients

• 
  1kg sweet potato (chopped)
• 1 large onion (chopped)
• 2 tbsp ginger paste
• 2 tbsp lemongrass paste
• 1 tbsp olive oil
• 1 cup vegetable stock
• 2 cups water
• 400ml coconut milk

Method

1. Using a large saucepan, fry onion in the olive oil until translucent, add ginger and lemongrass and cook for about 2-3 minutes.
2. Add sweet potato, vegetable stock and water. The liquid should just cover the sweet potato. Bring to the boil and then let simmer until sweet potato becomes tender.
3. Reduce heat then blend. (A stick blender would work well or transfer to a food processor then return to the saucepan.)
4. At a low to moderate temperature, add coconut milk and stir in thoroughly.