Lightly roast and grind the coriander seeds to a fine powder.
Melt butter, add onion, potato and garlic, sweat, add carrots, cumin and ground coriander seed and cook for further 2-3 minutes.
Add sherry and water or stock, bring to boil and simmer for 10-15 minutes until carrots are soft.
Liquidise and serve with fresh chopped coriander and a swirl of cream.