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Combine the cocoa and butter (don't use margarine!) in a small saucepan over medium heat.
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Melt and blend thoroughly, but DO NOT BOIL.
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Pour in boilinb water and blend.
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Add the sugar and corn syrup, but do not stir.
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Cover and bring to a low boil, allowing it to boil for 3 minutes without stirring.
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Uncover and boil 3 minutes more.
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Remove from heat and stir in vanilla.
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Allow to cool a bit more before enjoying over ice cream or warm cake.