Arrange pear slices in bottom of an 8" square baking dish. Combine sugar, flour and salt; sprinkle over pears. Cover with mincemeat; sprinkle with lemon juice and dot with butter.
Roll out Cheese Pastry to fit top of fruit in dish. Place on fruit. Crimp edges and cut vents for steam to escape. Bake in hot oven (425°) 35 to 40 minutes. Serve warm.