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Add the cocoa powder, sugar and salt to a heavy based saucepan. Pour in the hot water. Bring to the boil. Turn down the heat. Add the milk in small amounts. Pour in the caramel sauce. Remove from the heat. Serve.
Stir to combine all the ingredients. Stir constantly. Simmer for another 2 minutes. Stir constantly and keep heating without boiling. Stir constantly. Add the cinnamon too. Pour into 4 mugs. Add whipped cream and/or marshmallows for garnish, if desired.