Heat oil, coriander and cumin in a pan. Sauté for a short while.
Add onions and garlic (+ chilli) and sauté until soft.
Add chickpeas and tomatoes. Bring to boil and simmer for 10-20 minutes depending on how hungry the crew is.
Purée the soup. Add the coconut milk, lime juice, salt and sugar, and give it a quick mix. Voila!