Italian Olive Oil ExtraVirgin with “Halal” Certification.  Gretal Food Products: Who we are. The Gretal Online Store that allows direct purchase from the producer of Italian and Greek food products with Halal certification such as Greek Feta, Yogurt, EXTRA VIRGIN OLIVE OIL WITH HALAL CERTIFICATION, honey, kalamata olives, Gragnano pasta, authentic Genoese pesto, mozzarella buffalo