In a heavy saucepan over medium heat, combine the sugar, buttermilk, butter and corn syrup. Stir constantly about 20 minutes or until the mixture reaches 234 degrees on a candy thermometer (soft ball stage). Stir in the baking soda. Let stand at room temperature about 10 minutes or until the thermometer registers 180 degrees.
Meanwhile, lightly grease an 8-inch square baking pan and set aside. Stir in the extract and pecans. Beat with a wooden spoon 2 minutes. Pour into the prepared pan, cool completely on a wire rack and cut into squares.
Recipe by The Tennessee Magazine at https://www.tnmagazine.org/gift-baskets/