Heat olive oil in a large pot over medium heat. When shimmering, add the onion and cook for 5-7 minutes, until softened.
Add the bell pepper, carrot, celery, garlic, spices and harissa paste. Sauté for another 2-3 minutes or until fragrant.
Add the fire-roasted tomatoes, chickpeas, stock, and sugar. Season with salt and black pepper to taste.
Bring to a boil then reduce the heat to low and simmer for 10-15 minutes or until the vegetables have softened. Serve warm topped with cilantro and mint.
