Preheat oven to 180ยบ centigrad and bake the whole aubergines in the oven. I cut off the stem end previously so they don't explode! Once soft and cooked through, allow to cool and remove the skins. Chop roughly
Fry the onion in a good glug of olive oil and a couple of pinches of salt over a low to medium heat. After 5 minutes, add the chopped garlic and continue to cook until both are tender.
Add the chopped, baked aubergine and continue to fry for a couple of minutes then add the basil leaves.
Add water till it's just covering the vegetables. The more you add the thinner the soup will be.
Bring to a boil. Turn off the heat and blend with an immersion blender till it's smooth and creamy. Test for salt, adding more if necessary. Serve and enjoy