Take a pan and add olive oil into it and let it be on medium heat. Add onion, celery, garlic paste, pepper and mushroom into it. Let the onion turn red for 5 minutes or so. Add chicken broth into the mixture and let it heat for next 15 minutes. After that add sauce into the mixture and stir it for 2 minutes. Let the mixture heat for next 10 minutes. Serve it by garnishing with coriander leaves, mint leaves and lemon juice.