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35 grams of cocoa powder
4 tablespoons brown sugar
2 or 3 tablespoons flour (depending on if you want more or less thick)
500 ml soy milk
Put the cocoa, sugar and flour in a saucepan and mix well to avoid lumps.
Slowly add the soy milk, over a medium heat and mix well.
As soon as the mixture begins to boil is ready.
You can add cooked a pinch of soy butter.
(Thanks to Barbara)