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Prepare an 18x13 baking sheet by greasing with butter and set aside.
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In a small bowl, mix baking soda, salt and vanilla extract and set aside.
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In a large heavy bottomed pot, combine sugar, corn syrup and water.
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With a heat proof spoon or spatula, stir mixture constantly over very high heat until it reaches 240 degrees on candy thermometer.
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Add peanuts and continue stirring until mixture reaches 320 degrees on candy thermometer.
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Remove mixture from heat and stir in butter until melted.
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Stir in baking soda mixture. It will be foamy, stir until combined.
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Pour mixture onto baking sheet and let set until hard.
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Break into pieces.