This is a recipe video for making authentic chocolate canelés using cocoa powder. Heat the milk until just before boiling, then add the cooled milk and eggs to the dry ingredients (cake flour, bread flour, cocoa powder, sugar) and mix well. Strain the batter once and let it rest in the refrigerator for two days to enhance the flavor. Just before baking, add the rum, melted butter, and vanilla extract, and bake slowly in a preheated oven, gradually changing the temperature from high to low. The result is a chocolate canelé with a crispy, fragrant exterior and a chewy interior, boasting a prominent cocoa flavor. It's perfect for a home café, entertaining guests, or as a gift.