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Butter cookie sheet and large saucepan.
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In buttered saucepan, combine sugar, corn syrup and water, mix well.
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Bring to a boil, stirring constantly.
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Cook until candy thermometer registers 275 (soft-crack stage).
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Add butter, vanilla and nuts; cook, stirring constantly, until thermometer registers 300 (hard-crack stage).
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Remove from heat.
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Add baking soda; mix well.
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Stir in coconut.
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Quickly pour mixture onto buttered cookie sheet; spread very thinly.
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Cool 30 minutes or until completely cooled.
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(After 5 to 10 minutes of cooling, brittle can be stretched thinner with 2 forks.).
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Break into pieces.