In a bowl mix the oil with the yogurt and eggs –reserving 3 tablespoons of the eggs— the cheese and plenty of pepper. Taste and add salt if needed –usually feta is quite salty.
In a large skillet warm 3-4 tablespoons olive oil and sauté the leeks over medium heat, stirring every now and then, until soft, about 15 minutes. Preheat the oven to 400.
Pumpkin, Fennel and Mint pies are made in Chios and in other islands with and without cheese. The second version is the one for Lenten days, when all foods deriving from animals are banned from the table.