Sweet Potato soup - Asian style

Totally simple soup and Lindsay's favourite!

Ingredients
1Kg sweet potatoes
2 tsp oil
2 Tbsp shredded ginger
2 tsp cumin seeds
1 red chili, chopped
1 stalk lemon grass
2 cups vegetable stock
2 cups coconut milk
½ Tbsp brown sugar
1 Tbsp fish sauce
½-1 Tbsp lime juice

Method
Boil sweet potatoes until soft.
Heat oil in pan and gook ginger, cumin, chili and lemon grass for 3 mins
Combine sweet potato and spice mix and puree. Add stock and coconut milk to the mixture and heat until hot.
Stir through coriander and serve.