Wash tomatoes, scratch skin crosswise, briefly scald, quench and peel skin. Cut the tomatoes into quarters and dice. Peel or clean the carrot, zucchini and peppers, wash and cut into pieces. Peel onions and garlic. Cut onions into strips, chop garlic finely. Wash oregano and chop finely, except for something to garnish
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Season soup to taste with salt and pepper and serve. Slice parmesan cheese over it. Garnish with remaining oregano