In the villages of Crete and the mountains of Epirus, hortopita is what cooks make from whatever greens are growing on the hillsides: wild fennel, sorrel, poppy leaves, nettles and chard. Many families bake it during Lent, when cheese and eggs are put aside, so the filling relies on olive oil, leeks and a big handful of herbs for flavour. It is earthy, a little bitter and very fresh. This version uses easy-to-buy chard, spinach, fennel fronds and leeks, with a spoonful of rice to soak up the juices. Serve warm or cold with olives and a glass of something cold. Most shop fillo is made without butter or egg, but check the label to keep it vegan. Chef's tip: salt the chopped greens and leave them for 20 minutes before squeezing; skipping this is the most common mistake, and it makes hortopita watery.