Heat half of the olive oil in a large pot over medium heat. Sauté the onion for 1-2 minutes until softened. Add garlic and cook for another 30 seconds until fragrant.
Add carrots, celery, oregano and rosemary to the pot. Stir in chickpeas and vegetable stock, salt and pepper. Bring to a simmer, covered for 25-30 minutes.
Once the soup is cooked, turn off the heat. Adjust for salt and pepper, add the lemon juice, remaining olive oil and chopped dill leaves if desired.
Notes
Storage: Cool soup to room temperature, transfer to an airtight container, label, and refrigerate or freeze. Keep in the fridge for up to 4 days, in the freezer for up to 3 months.