Rice's Sweet Potato and Carrot Soup

Hi, my name is Rice. The following is my delicious and easy Sweet Potato and Carrot Soup.

Ingredients
2 sweet potatoes peeled and chopped 2 large carrots peeled and chopped 1 large white onion chopped 1/2 tsp ground cumin 1/2 tsp ground coriander seed 1 vegetable stock cube

Method
Place all ingredients in a large saucepan and pour over 1.25 litres boiling water. Bring back to the boil and allow to simmer for 20 minutes or until the vegetables are tender. Allow to cool then blend in a food processor or blender.
 * Reheat and enjoy, adding chopped coriander leaves if desired.