Line a baking sheet with aluminum foil.
In large saucepan over medium heat, combine pecans, sugar, butter, brown sugar, milk and vanilla. Heat to between 234 and 240 degrees F (112 to 116 degrees C), or until a small amount of syrup dropped into cold water forms a soft ball that flattens when removed from the water and placed on a flat surface.
Drop by spoonfuls onto prepared baking sheet.Let cool completely.
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