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Add the water into the bottom chamber of the stovetop espresso pot.
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Fill the filter basket that fits over the water with the ground espresso coffee; add cocoa, cinnamon and chile tamping down gently.
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Place on the stovetop burner over medium-low heat. Watch carefully and remove from the heat as soon as the intense boiling has stopped, about 2 minutes.
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Warm milk and sugar (if using) in microwave or stovetop until steamy, but not boiling.
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Pour the milk in a blender and blend till it develops a thick layer of froth. You can also use an electric whisk for this purpose.
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The espresso is ready when all the water has boiled through the filter into the top part of the pot.
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Pour the coffee into the mug; top with frothed milk. Serve immediately.