Rosemary's Sweet Potatoes

1 large sweet potato per person +1 (*)
1 stick butter
3/4 cup raisins
15 oz. can crushed pineapple
1 1/2 cups brown sugar
cinnamon, nutmeg, allspice
marshmallows

Cut potatoes in half; put open side down on cookie sheet. Bake at 350 for 40-60 minutes.
Scoop and mash wih other ingredients.
Put in casserole; cook until heated through.
Put marshmallows on top and, watching constantly, toast under broiler just before serving.

(*) Above amounts correspond to 5 potatoes.
Also, 3-4 cans whole yams = 5 potatoes