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In a deep medium saucepan add sugar, corn syrup, water, and vanilla. Over medium-high heat bring the mixture to a boil (without stirring) and cook until hard crack stage, i.e. until temperature reads 300 degrees F. on a candy thermometer. This should take about 10 minutes. If sugar crystals form on the sides of the pan during the cooking process, brush the sides of the pan with a clean pastry brush dipped in water.
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Remove from heat. Working quickly, add the baking soda and quickly blend to incorporate the soda into the sugar mixture, about 5 seconds. As you can see in the photo, the mixture will bubble up when you add the baking soda. Be very careful not to touch the hot mixture.
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