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For 4 people: 3 cups of soy milk (or rice)--1/2 cup of strong coffee-4 tbsp unsweetened cocoa powder
Very strong black coffee prepared in this then blend the cocoa powder, being very careful that no lumps are formed.
In the meantime you brought to a boil the soy milk (or rice); Add the coffee in the boiling milk, stir and let stand for 10 minutes.