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In a heavy saucepan over medium heat, melt chocolate with milk stirring constantly until chocolate is completely melted.
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Add sugar, salt and corn syrup to saucepan and stir just until mixture comes to a boil.
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STOP STIRRING when mixture boils.
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Clamp candy thermometer on side of saucepan and let mixture boil to temperature of 238 F.
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Remove from heat immediately.
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DO NOT STIR!
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Add butter, without stirring, to chocolate mixture.
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Let cool to at least 110 F, then add vanilla.
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Now it's time to stir.
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Beat mixture by hand or with hand held mixer until fudge loses it's glossiness and thickens slightly.
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Pour fudge onto a waxed paper lined 9 inch pan and let set for a few hours.