Blackberry cake with diplomat mousse

Blackberry cake with diplomat mousse is served cold for birthdays, with soaked sponge and two layers of cream. The tart blackberries and orange cream make a lovely contrast, while the sponge stays soft after a night in the fridge. For the blackberries, I choose ripe, fragrant ones that are still firm. Prep: 75 minutes. Cook: 44 minutes. Rest: 8 hours. Total time: 9 hours and 59 minutes. Servings: 20. Approximately 270 kcal and 5 g protein per serving.
Ingredients
For the sponge
- 6 eggs
- 1/8 teaspoon salt
- 12 tablespoons sugar
- 6 tablespoons water
- 1 teaspoon vanilla extract
- 12 tablespoons flour
- 1 teaspoon baking powder
For the syrup
- 250 ml water
- 60 ml orange juice
- 4 tablespoons sugar
- 1 vial rum essence
For the blackberry mousse
- 300 g blackberries
- 5 tablespoons sugar
- 2 sachets vanilla sugar
- 50 ml cold water
- 10 g gelatin
- 350 ml whipping cream 30% fat
For the diplomat mousse
- 3 egg yolks
- 5 tablespoons sugar
- 2 sachets vanilla sugar
- 1 teaspoon grated orange zest
- 1 teaspoon cornstarch
- 150 ml milk
- 50 ml cold water
- 10 g gelatin
- 300 ml whipping cream 30% fat
- 1 tablespoon sour cream
For decorating
- 300 ml whipping cream 30% fat
Preparation
1. Heat the oven to 180°C. Separate the eggs, beat the whites with the salt, then gradually add the sugar and beat until stiff peaks form. Fold in the water, egg yolks and vanilla, then the flour mixed with the baking powder, in 2-3 batches, using a spatula. 2. Pour the batter into a 35 × 25 cm pan lined with parchment paper. Bake for 25 minutes, until golden and springy to the touch. Leave to cool, then cut into two layers. 3. Bring the water, sugar and orange juice to a boil and simmer for 4-5 minutes, until the sugar dissolves. Leave the syrup to cool, then add the rum essence. 4. Cook the blackberries with the sugar and vanilla sugar for 5-6 minutes, until softened. Blend them, strain the purée through a sieve and leave to cool. Bloom the gelatin in the cold water, melt it and stir it into the purée. 5. Beat the cream for the blackberry mousse until stiff, then fold in the cooled purée. Mix until smooth. 6. Beat the egg yolks with the sugar, vanilla sugar, orange zest and cornstarch. Gradually pour in the milk, then put the mixture over low heat and stir constantly for 7 minutes, until thickened. Leave the custard to cool slightly. 7. Bloom the gelatin in the cold water, melt it and stir it into the egg custard while it is still slightly warm. Beat the cream for the diplomat mousse with the sour cream until stiff, then fold in the egg custard. 8. Place the first sponge layer in a springform pan and soak it with syrup. Spread the blackberry mousse on top, then the diplomat mousse. Add the second layer, soak it with syrup and cover the pan with plastic wrap. 9. Refrigerate the cake for at least 8 hours. Carefully turn it out onto a platter and remove the plastic wrap. Whip the cream for decorating, cover the cake with it and, if you like, add an edible image.
Notes
Keep covered in the fridge for up to 3 days, and you can assemble it the night before. Cut it cold and serve with a cup of black tea. For frozen blackberries, thaw them in a sieve and let the juice drain before cooking. Very ripe fruit may release more liquid, so strain the purée carefully. A 35 × 25 cm pan and a blender are useful here; the cake contains gluten, eggs and dairy.
Frequently asked questions
Why does the blackberry mousse stay soft?
The cream needs to be whipped until firm, and the gelatin must be completely dissolved. Leave it to bloom for 10 minutes before melting it.
What should I do if the diplomat cream is lumpy?
Strain the warm custard through a fine sieve before adding the gelatin, then continue with the cream.
Can I replace the blackberries with raspberries?
Yes, use raspberries instead and strain the purée twice to remove the small seeds.
How do I get neat slices?
Leave the cake at room temperature for 15 minutes before cutting it, and wipe the knife blade after each slice.
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