Kamote Pie

1/3 lb kamote (sweet potato)
1 egg, beaten
1/3 cup margarine, softened
2/3 cup milk
3 tbsps granulated sugar
1-1/2 tsp vanilla essence
3 tbsps brown sugar
water (for boiling sweet potatoes)
1/4 tsp salt
1 pie case

* Boil camote on salted water. Mash when cooked.
* Mix margarine, salt and sugar in a large bowl.
* Whisk until creamy. Place camote and mix well.
* Add beaten egg, milk and vanilla and whisk at low speed.
* Pour mixture onto unbaked pie case. Bake at 350° F until done.
* Cool for several minutes before serving.