Purple Plum Pie

4 cups fresh plums (about 1 1/2 pounds) -- sliced

1/2 cup sugar

1/4 cup all-purpose flour

1/4 teaspoon salt

1/4 teaspoon ground cinnamon

1 tablespoon lemon juice

1 unbaked deep-dish pastry shell (9 inches)

Topping: 1/2 cup sugar

1/2 cup all-purpose flour

1/4 teaspoon ground cinnamon

1/4 teaspoon ground nutmeg

3 tablespoons cold butter or margarine

In a bowl, combine the first six ingredients; pour into the pastry shell. For topping, combine sugar, flour, cinnamon, and nutmeg in a small bowl; cut in butter until the mixture resembles coarse crumbs. Sprinkle over filling. Bake at 375 degrees for 50-60 minutes or until bubbly and golden brown. Cover edges of crust during the last 20 minutes to prevent overbrowning.