Chocolate Espresso Cannelés

Prepare the Batter

1. 1Infuse the milk: In a saucepan, gently heat the milk with the finely chopped dark chocolate until the chocolate is melted and fully incorporated. Do not boil. Remove from heat and stir in the espresso powder and vanilla extract. Let it cool slightly.
2. 2Whisk eggs and yolks: In a large bowl, whisk together the whole eggs and egg yolks until lightly beaten.
3. 3Combine wet and dry: Gradually whisk the slightly cooled chocolate-milk mixture into the eggs. Then, whisk in the melted butter and dark rum.
4. 4Add flour and sugar: Sift the flour and sugar together. Gradually add this to the wet ingredients, whisking until just combined and smooth. Avoid overmixing.
5. 5Rest the batter: Cover the bowl and refrigerate the batter for at least 24 hours, or up to 48 hours. This resting period is crucial for developing the cannelé's characteristic texture and flavor.

Bake the Cannelés

1. 1Preheat the oven: Preheat your oven to 230°C (450°F). Ensure your oven rack is in the center position.
2. 2Prepare molds: Generously grease traditional copper cannelé molds with softened butter and then with a thin layer of melted beeswax. This is essential for achieving the deep, dark crust.
3. 3Fill molds: Give the rested batter a gentle stir. Fill each prepared mold about three-quarters full. Do not overfill, as they will puff up during baking.
4. 4Initial high-heat bake: Place the filled molds on a baking sheet and bake in the preheated oven for 15 minutes.
5. 5Reduce heat and continue baking: Reduce the oven temperature to 190°C (375°F) and continue baking for another 45 to 60 minutes, or until the cannelés are deeply caramelized, dark brown, and firm to the touch. The cooking time will vary depending on your oven and mold type.
6. 6Cooling: Once baked, immediately remove the cannelés from the oven. Carefully unmold them onto a wire rack and let them cool completely. They should have a crisp exterior and a soft, custardy interior.