Duo walnut cake with diplomat cream

Duo walnut cake with diplomat cream layers syrup-soaked walnut sponge with diplomat cream and cocoa-hazelnut mascarpone cream. It’s turned out of a bowl with raspberries and peaches inside, then decorated with whipped cream and chocolate. I cut it into narrow slices and serve it cold, once the cream has set well. Prep: 50 minutes. Cook: 41 minutes. Rest: 5 hours. Total time: 6 hours and 31 minutes. Servings: 10. Approximately 650 kcal and 13 g protein per serving.
Ingredients
For the walnut sponge
- 4 eggs
- 1 pinch salt
- 4 tablespoons sugar
- 3 tablespoons flour
- 5 tablespoons ground walnuts
For the syrup
- 3 tablespoons sugar
- 30 ml water
- 1/2 teaspoon rum essence
For the mascarpone cream
- 200 g mascarpone
- 200 g Duo cocoa-hazelnut spread
- 100 ml whipping cream
For the diplomat cream
- 5 eggs
- 200 g sugar
- 30 g powdered gelatin
- 150 ml cold water
- 300 ml whipping cream
- 125 g raspberries
- 2 red peaches (300 g)
For decorating
- 100 g chocolate
- 100 ml whipping cream
Preparation
1. Preheat the oven to 180°C and grease an 18 cm cake tin, then dust it with flour. Beat the egg whites with a pinch of salt until stiff, add the sugar and beat until you have a firm meringue. Fold in the yolks, then the flour and ground walnuts. Pour the mixture into the tin and bake for 25 minutes, until the sponge has risen and passes the toothpick test. 2. Leave the sponge to cool for an hour, then cut it into four layers. 3. To make the syrup, caramelize the sugar for 3 minutes, until amber-colored. Pour in the water and boil for another 2 minutes, until the caramel dissolves. Take the saucepan off the heat and add the rum essence. 4. Whip the cream and mix it with the mascarpone and Duo spread. Set aside 2 tablespoons for decorating. 5. Leave the gelatin to bloom in the cold water for 10 minutes. Mix the eggs with the sugar in a bowl set over a pan of simmering water and cook for 8 minutes, stirring, until thickened. Stir the gelatin into the warm mixture and leave it to cool until lukewarm. Whip the cream separately and fold it into the egg mixture. 6. Line a large bowl with plastic wrap. Place the first sponge layer in the center and brush it with a quarter of the syrup. Spread on a third of the mascarpone cream. Continue with the next two layers, brushing them with syrup and spreading them with cream, then place the final layer on top and brush it with syrup. 7. Arrange the raspberries and sliced peaches around the sponge, then pour the diplomat cream into the bowl. Refrigerate the cake for 4 hours, until set. 8. Turn the cake out onto a serving plate. Melt the chocolate over a pan of simmering water for 3 minutes, then spread it into a strip and place it around the cake. Whip the cream for decorating and use it, along with the reserved cream, to decorate.
Notes
The sponge slices more cleanly after resting overnight; choose firm peaches, and wash and dry the raspberries well. I posted it because it was my work, made for my father’s birthday on October 11; it seemed as showy as the birthday boy, even though I wasn’t happy with how it turned out, and I’d ticked off another Libra, with one more to go. The cake contains nuts, gluten, eggs and dairy. A cold slice goes well with black coffee. Keep it covered in the fridge for up to 3 days.
Frequently asked questions
Can I use yellow peaches?
Yes, use 300 g of fresh, firm yellow peaches, cut into small pieces.
What can I use instead of Duo spread?
Use 200 g of cocoa-hazelnut spread, in the same amount.
Why does the diplomat cream stay soft?
The gelatin needs to dissolve completely in the warm base, at around 60°C. If any undissolved granules remain, the cream won’t set evenly.
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