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Add the pecans, sugar, and butter to an 8-inch skillet.
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Over medium heat, stir constantly for 6-8 minutes or until the sugar is melted and is a rich brown color.
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Take skillet from stove; spread nuts on a buttered baking sheet or piece of foil.
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Separate nuts into clusters; let cool; break clusters into small chunks; set aside.
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In a mixing bowl, add the half-and-half, brown sugar, and vanilla; stir to mix well and until the sugar is dissolved.
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Add in the whipping cream; stir to combine.
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In a 4- to 5-quart ice cream freezer, freeze cream mixture according to the manufactuer's directions.
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Stir in pecans.
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Ripen for 4 to 24 hours.