Heat oil in a large pot over medium heat and cook onion until soft and translucent, about 5 minutes. Add tomatoes, chickpeas, cilantro, parsley, mint, paprika, turmeric, ginger, harissa, and saffron. Add water and cook over medium heat until flavors have combined, about 30 minutes.
Mix a few tablespoons of soup liquid with flour and cornstarch in a small bowl and return to the soup, stirring in well. Add cherry tomatoes. Bring to a boil, reduce heat, and simmer over low heat until soup thickens, about 10 minutes. Season with salt and pepper.
If you have time, peel your tomatoes. To do this, cut an X on the bottom of each, submerge in boiling water for 25 seconds, transfer to an ice water bath, then peel gently and dice.
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