Amish Vanilla Pie
From: Farm Journal's Great Home Cooking In America

1 unbaked 9-inch pie shell

PIE FILLING:
1/2 cup brown sugar, firmly packed
1 tablespoon flour
1/4 cup dark corn syrup
1 1/2 teaspoons vanilla
1 egg, beaten
1 cup water

CRUMB TOPPING:
1 cup flour, unsifted
1/2 cup brown sugar, firmly packed
1/2 teaspoon cream of tartar
1/2 teaspoon baking soda
1/8 teaspoon salt
1/4 cup butter or regular margarine

Prepare pie filling:
Combine 1/2 cup brown sugar, 1 tablespoon flour, corn syrup, vanilla, and egg in 2-quart saucepan. Slowly stir in water. Cook over medium heat, stirring constantly, until mixture comes to a boil. Let cool.

Prepare crumb topping:
Combine 1 cup flour, 1/2 cup brown sugar, cream of tartar, baking soda, salt, and butter; mix until crumbly.

Pour cooled pie filling into pie shell; top with crumbs.

Bake in 350 oven 40 minutes or until golden brown.