Boil the zucchini for 5 minutes. Pass them under water to cool them and cut them in two equal parts lengthwise. Dig the two parts of the pulp that you will collect in a bowl.
Peel the celery, cut into small pieces and put it in water acidulated with lemon juice because it gets dark. Peel and cut into chunks the potatoes. Melt 40g of butter in a saucepan and add the minced onion (cleaned), sauté then add the celery and potatoes stew making a very low heat….