Method

1. Combine the flour, salt and butter in the bowl of a food processor fitted with a steel blade and pulse until the butter is the size of peas. Add one of the eggs, 3 tablespoons of the milk, and vinegar and pulse until the dough becomes a ball. If the dough doesn’t come together, add ice water a tablespoon at a time until you have a ball. (If you don’t have a food processor, you can make the dough in a bowl. Just use a pastry blender to incorporate the butter into the flour and then stir in the remaining ingredients.) Flatten the ball of dough and wrap in plastic wrap. Refrigerate for about an hour.
2. Meanwhile, heat the oil in a large skillet and add the spinach. Briefly saute the spinach just until it wilts. Remove from heat and set aside.
3. In a large bowl, combine the cheeses, one egg, pepper and sauteed spinach.
4. Combine the remaining egg and milk in a small bowl and beat to combine.
5. Preheat the oven to 375° F. Remove the dough from the refrigerator and roll it on a well-floured surface until it’s about 1/8 inch thick. Cut out about 20 circles with a biscuit cutter or drinking glass. You’ll have to cut circles and then re-roll the scraps in order to use all the dough. Brush the edges of half of each circle with a little of the glaze mixture. Fill each circle with about a heaping teaspoon of filling mixture (you should use all the filling). Fold the dough over to form half circles, and stretch it enough so that you can close the circles securely. Use your thumb and forefinger to pinch the dough closed as pictured above.
6. Place the pies on a baking sheet and brush lightly with the remaining glaze. Bake for about 15 to 20 minutes, or until the pastry is golden brown and the filling is heated through. Cool before eating.