Two shoppers in California are looking to sue Cento Fine Foods, alleging it is committing "tomato fraud." The proposed class-action lawsuit accuses the company of falsely branding its tomato products with claims that it uses San Marzano Certified tomatoes, ABC News reports . That specific type of tomato is grown in Italy’s Campania region, and is prized for its flavor. In the same way that sparkling wines marketed as champagne should originate from France's Champagne region, under European Union law and international treaties, a true San Marzano tomato should always originate from Campania in southern Italy under E.U. rules. "Defendant's marketing and labeling of Cento San Marzanos as 'Certified San Marzano' tomatoes is false, misleading, and unfair," the lawsuit states.…