Preheat oven to 400. Pierce potatoes with fork and place on baking sheet. Bake until done, about one hour.
While potatoes are baking, purree pears and 1/4 cup juice.
Remove potatoes and peel. Beat potatoes and butter with electric mixer. Mix in pears, sugar, cinnamon and nutmeg. Season with salt and pepper. Butter a 13x9 inch glass baking dish and add potato mixture. Bake at 350 uncovered untl just heated through about 20 minutes.
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