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Easy
Make a battuto with ¼ of an onion, celery, carrots, and parsley. Put on the fire with some oil, and when it starts to brown add the zucchini, cut into small pieces, and season with salt and pepper. When the zucchini has browned, finish cooking with water, pass through a sieve, and add the Parmesan cheese and eggs.
Make a béchamel sauce with