Open tin can with fresh tomatoes
Food - Drink
The DOP Label On Canned Tomatoes Will Tell You A Lot On What's Inside
DOP (Denominazione d'Origine Protetta) status, or Protected Designation of Origin in English, is for Italian food products that can only be produced in one region to be authentic.
San Marzano tomatoes have DOP status because they are grown in an area whose geographic features make them unique and exceptional, and their production is tightly controlled.
Every authentic can of DOP San Marzano tomatoes will contain peeled tomatoes that are either whole or cut in half. They won’t come in cartons or be sold diced or pureed.
The cans should also have a seal, which might be printed in English as "Protected Designation of Origin" or PDO, but be sure to read the details of this seal to avoid fakes.