Peel and chop the onion, clean and slice the carrots. Wash the coriander, cut off the stems and chop the leaves.
Heat the oil in a pan and fry the onions and carrot slices in it. Stir every now and then. When the onions are soft, stir in the ground coriander and cook for about 1 minute. Put the contents of the pan in a saucepan, season with salt, pepper and pour in the broth. Bring to a boil, turn down the heat and simmer for about 20 minutes until the carrots are tender.
Lightly puree the soup, season again and serve garnished with the chopped coriander leaves.