Preheat oven to 400°. Pour butter into a large baking pan. Tilt pan to coat with the butter. Arrange pears in one layer, cut sides down. Roast 20-25 minutes or until tender when pierced with a knife.
Combine vinegar and honey. Spoon mixture over pears, and bake 5 minutes more. Arrange pear halves on each of 10 dessert plates. Spoon pan juices over top, add pepper and 1/4 cup ice cream; serve.
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