Haris Tzannis's connection with Greek products and small local producers began long before his involvement in wholesale trade. As a taste journalist, he traveled across Greece for years, searching and tasting the finest products to recommend to his readers, ranging from cheeses and cold cuts to ready-made pies and preserved goods, products that are rarely found outside their local regions. Gradually, he became a vital link between these producers and the market in Athens.

Many chefs, whom Tzannis used to interact with, would call him asking about specific products he featured, like a unique cheese from Naxos, questioning how they could procure it. Realizing that finding these local treasures was not always straightforward, he decided to fill the market gap he identified. He transitioned from media to actively support small producers by distributing their goods centrally, thus aiming to increase their accessibility to consumers.

This endeavor led to the establishment of Deliο in Koukaki in 2020, where he collaborates with his partner Maria. The shop serves as a platform to showcase select Greek delicacies, bridging the gap between local artisans and the broader market, while fostering a deeper appreciation for the rich culinary heritage of Greece.