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Continue to cook to 300 degrees F, on a candy thermometer or hard crack stage, about 10 minutes. Cook's Note: You can use a candy thermometer or a simple trick: take a spoon and drop a tiny drizzle of the mixture into a bowl of water. If it crystallizes, you've reached the hard crack stage.
Remove from the heat, using a wooden spoon, stir in the baking soda quickly. It will become frothy. Pour into an 8 by 8-inch/20 by 20-cm pan, lined with parchment paper and buttered.
Let cool for about 30 minutes and break into pieces.