Place sliced peaches in pastry lined 9 inch pie pan.
Combine brown sugar, flour, salt and butter in sause pan. Cook until thick, stirring frequently. Do not over or under-cook, just until it thickens. Does not take too long.
Remove from heat. Add lemon juice, stir into mixture until completely incorporated then pour over peaches in the pie pan. Top with crust. Bake in oven pre heated to 425 degrees for 30 minutes, or til done.