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Combine sugar,cocoa and salt in a large,heavy bottom saucepan.
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Stir to mix and break up any lumps of cocoa powder.
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Add the corn syrup,milk and 2 tbsp butter.
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Place over medium heat andcook, stirring constantly, until the mixturecomes to a boil.
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Stop stirring,cover the panawith a tight-fitting lid for about a minutesto steam off any sugar crystals on the sides of the pan.
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Watch closely so it won't boil over.
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Uncover and continue to cook while stirring scraping sides from time to time,until temperature reaches the soft ball stage.
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Pour the fudge onto a large platter.
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Heat the lemon zest,juice and vanilla to boiling and pour over the hot candy.
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Top with remaining 2 tables.
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of butter.
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Let the mixture cool to room temp.
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Then stir until thick, add nuts and spread onto a buttered plater.