Step 1: Butter a 9 x 9-inch pan and set aside.
Step 2: In a heavy 2-quart saucepan, combine the syrup, sugar and vinegar.
Step 3: Bring to a boil over medium heat, stirring constantly until the sugar dissolves.
Step 4: Continue cooking without stirring until a candy thermometer reads 300°F Remove from heat and quickly stir in the soda; mix well.
Step 5: Pour into prepared pan. Do not spread.
Step 6: Cool and break into pieces.
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