Anastasia Miari’s grandmother’s entire day revolves around food. In her 80s, she lives on the beautiful Greek island of Corfu, where she still makes her own olive oil and wine. “My grandmother is one of those people who have always eaten seasonally,” said Miari, a UK-based author and journalist, chatting with me on the phone from her Corfu home near the beach. “Before there were ‘clean eaters’ out there, there were our grandmothers.” Her grandmother, known to her grandchildren as Yiayia, uses permaculture in her planting techniques, and enjoys a mainly vegetarian diet. She cooks from scratch over an open fire. “My Yiayia is quite stern and strict; she doesn’t show her feelings easily,” Miari said. “She’s had a hard life, growing up on this agricultural island. Food is how she shows her love for us. She’s always saying, ‘What would you like me to make for you, and how …