Sour Cream Raisin Pie with Brown Sugar Meringue

1 prepared, blind-baked, deep dish pie shell
1 cup golden raisins
2 large eggs, separated
1 cup sour cream (not light)
3/4 cup brown sugar
1 tbs flour
1 tbs rum
1/4 tsp ground cinnamon
1/4 tsp ground nutmeg
pinch salt
In a large bowl, whisk together yolks and sour cream. Whisk in 1/2 cup of the brown sugar, flour, rum and spices. Fold in raisins. Pour mixture into prepared pie shell and place in a 400F oven. Bake for 10 minutes, then reduce temperature to 350F and bake another 30 minutes, until filling is set. Cool to room temperature.
In a large bowl, beat egg whiles until they hold soft peaks. Gradually add remaining brown sugar, beating until meringue holds stiff peaks. Spread over surface of pie, sealing it to the edges of the crust. Bake until meringue is golden, about ten minutes.