Add oil to the casserole, followed by onion and garlic. Cook for 2 minutes until the onion is translucent.
Add the chopped tomatoes and cook for a couple of minutes until the tomatoes are soft and mushy.
Add water and let it boil.
Add fresh basil and bread slices, mix well, and cook until the bread is soft and well combined with the soup.
Add salt, pepper, and sugar. Cook for a few more minutes.
Turn off the heat, after the soup comes down to room temperature, blend and sieve the soup. Add it again to the casserole and cook for a few more minutes.
Do a taste test, and adjust salt, sugar, and pepper if required.