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Preparations: Butter a cookie sheet;place in warm oven to keep warm-to hot. Combine the baking soda and vanilla in a small cup and set aside.(this keeps the soda from brown flaking in your syrup).
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Combine sugar,water and corn syrup in heavy saucepan.
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Bring mixture to full boil over high heat, stirring until mixture appears clear.
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Cook to hard crack stage- 290 degrees.(No thermometer? Fill a cup with cold water and drip a drop of the syrup into water. Feel the drop at the bottom of the cup -- if it's hard and brittle, it's ready!
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Meanwhile, put the measured peanut butter and peanuts in a medium size bowl and microwave on defrost or half power to warm .
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When the syrup hits 290 remove from heat and add vanilla,soda and the warmed peanut butter mixture. Combine and stir quickly.
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Working quickly, pour onto a very warm - hot buttered cookie sheet; spread with large spoons or forks.
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Cool; break into pieces.