1.Heat oil in a large saucepan. Stir onion and garlic over heat until onion softens. Add curry paste and continue stirring for 5 minutes.
2.Add water, cauliflower, potato and paste; bring to a boil. Reduce heat and simmer without lid for about 15 minutes or until vegetables are tender. Cool 15 minutes.
3.In batches, blend or process soup until smooth. Return soup to same cleaned pan, add buttermilk and stir over low heat until hot.
4.Serve bowls of soup sprinkled with coriander and, if desired, accompanied with warmed naan bread.
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