In a large bowl, crumble the Feta PDO and add freshly ground pepper. In another bowl, beat the eggs with a whisk and pour them into the bowl with the Feta PDO. Add the milk and 70 ml olive oil and mix well. Line a baking pan with three sheets of phyllo dough, brushing or drizzling each sheet lightly with olive oil. Add the filling and spread it evenly. Cover with the remaining three sheets of phyllo, brushing or drizzling each sheet with olive oil.Fold any overhanging edges of the phyllo inward. Score the pie into portions. Bake in a preheated oven at 180°C for about 1 hour, or until golden brown.