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+ servings
Prep Time 30 minutes
Cook Time 45 minutes
Total Time 1 hour 15 minutes
Servings 8 servings
Calories 777 kcal

Ingredients
 

For the cocoa sponge cake:

  • 6 eggs
  • 3/4 cup sugar
  • a pinch of salt
  • 3 tbsp oil
  • 1/3 cup cocoa powder
  • 1 cup flour

For the chocolate ganache buttercream:

  • 7 oz dark chocolate 60% cocoa
  • 3/4 cup for whipping sour cream
  • 2/3 cup butter
  • 1 tbsp rum extract

For the rum syrup:

  • 1 1/2 cups water
  • 3/4 cup sugar
  • 1 vial rum extract

For the chocolate glaze:

  • 1/2 cup sugar
  • 1/3 cup water
  • 3.5 oz dark chocolate
  • 2 tbsp butter

Instructions
 

  • Let’s start by separating the eggs. Beat the egg whites with a pinch of salt until they turn into a glossy, airy foam. Gradually add the sugar while mixing continuously until you get a stiff, shiny meringue. In a separate bowl, whisk the egg yolks with the oil, then pour this mixture over the whipped egg whites and gently fold it in with a spatula.
  • Now it’s time for the flour, which you’ve already mixed with the cocoa powder and sifted. Add this dry mixture over the batter. Gently fold with broad movements from bottom to top, just until all the flour is fully incorporated and no dry bits remain.
  • Carefully spread the batter into a baking pan (about 9 x 13 inches / 22 x 30 cm) lined with parchment paper, then place it in the oven. Bake for about 35–40 minutes at 340 °F (170 °C). Once the cake is nicely browned and baked through, take it out of the oven and transfer it to a cooling rack so it can cool down completely. Afterwards, slice it into two equal layers.
  • The cream is incredibly easy to make! It’s basically a rich chocolate ganache with butter, very smooth and full of flavor. Heat the heavy cream until it just comes to a simmer. As soon as you remove it from the heat, add the chopped chocolate and stir until it melts completely and you get a smooth, glossy mixture with no lumps. Let it cool down.
  • Beat the butter for 2–3 minutes until creamy, then gradually mix in the cooled ganache (around 68-77 °F / 20-25 °C). For the syrup: melt the sugar carefully without burning it. Add warm water and simmer until all the sugar dissolves. Stir in the rum extract only after the syrup has cooled.
  • The glaze is very simple to make: simmer the water with the sugar for 3–4 minutes, until it turns into a light syrup (ideally around 221 °F / 105 °C). Add the chocolate and butter, stirring well until fully combined. Once smooth and glossy, the glaze is ready.
  • Assembly: Place the first cake layer back into the pan and soak it with syrup. Spread the chocolate cream on top (reserve a small amount for decoration) and level it. Place the second layer on top and soak it as well. Cut the cake into squares and separate the pieces so they can be glazed individually.
  • Glaze each piece evenly. Decorate with small rosettes of the reserved cream on top and chill the cakes for a few hours. The amandine cakes are incredibly delicious!

Notes

  1. Bake the sponge one day in advance if possible; a slightly rested cake soaks up the rum syrup more evenly and cuts into cleaner layers.
  2. Make sure the ganache has cooled to room temperature before mixing it into the butter so the cream does not split or turn greasy.
  3. Do not rush the syrup: simmer until the sugar is fully dissolved, then let it cool completely before adding the rum extract to keep the aroma strong.
  4. For neat squares, chill the assembled cake for at least 2 hours before cutting, wiping the knife with a warm damp cloth between cuts.
  5. If the glaze thickens while you work, warm it gently over a water bath for a few seconds; it should be fluid but not hot when you pour it over the cakes.

Nutrition

Serving: 1serving | Calories: 777kcal | Carbohydrates: 82g | Protein: 10g | Fat: 47g | Saturated Fat: 25g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 15g | Trans Fat: 1g | Cholesterol: 185mg | Sodium: 209mg | Potassium: 416mg | Fiber: 6g | Sugar: 60g | Vitamin A: 887IU | Vitamin C: 0.2mg | Calcium: 82mg | Iron: 6mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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