1 1/2 cups water (add 1/2 cup more for a thinner cup of hot chocolate)
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1 1/2 teaspoons cinnamon
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3 teaspoons pure vanilla (use Mexican vanilla, if you have it)
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Grate the chocolate with a fine-edged grater. In a large saucepan, heat the milk, ice cream and sugar on low, just as the mixture begins to steam (but don’t let it boil!) then whisk in the grated chocolate. Whisk in the cinnamon, vanilla and water.