Peel the onions and cut into fine cubes. Sweat in sunflower oil until translucent. Add red lentils, tomatoes with juice and coconut milk and stir well. Pour in the vegetable stock and simmer the soup for about 20 minutes.
Finally, season with salt, chilli and turmeric powder.
The soup tastes twice as good the next day. It goes well with prawn skewers and baguettes.