Boil the carrots, the zucchini, the onion, the tomatoes, the tomato paste and the leaf celery in a deep pot for 15 minutes and season with salt and pepper. Add the fish and the oil and continue boiling for an additional 10 minutes.

Strain the food, placing the fish and vegetables in a platter and the stock back into the pot. Add the midolline and boil it making sure that you leave it with plenty of stock because as it cools it will absorb it. Besides, don't forget that you are making a soup! 

Always serve hot! Bon appétit!