Preheat oven to 180°C. Using your hands, combine flour, salt and butter until the mixture resembles bread crumbs.
Add the water and knead well until a dough forms and becomes elastic. Wrap the dough with cling film and refrigerate for at least ½ hour.
Divide the dough into 2 pieces and roll them into sheets approximately ½ cm thick.
Grease a deep baking dish with butter and cover the bottom and the walls of the dish with one of the sheets of dough.
Place the pear slices on the bottom of the dough-covered baking dish followed by the cherry tomatoes, onions, feta cheese, chopped sausage, all the herbs, salt and pepper.
Cover the pie with the second sheet of dough and brush the surface with milk. Bake for 1 hour.