
Ingredients
Cake layers (biscuit):
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6 medium eggs
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75 g caster sugar (6 tbsp)
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75 g plain flour (6 tbsp, leveled)
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⅓ of the prepared caramel (see below)
Syrup:
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½ cup sugar
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240 ml water (1 cup)
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30 ml brandy, cognac, or dark rum (2 tbsp)
Caramel with walnuts:
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400 g granulated sugar
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400 g walnuts
Filling 1 (Caramel cream):
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250 g unsalted butter, softened
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250 g icing sugar (powdered sugar)
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4 medium egg yolks
Filling 2 (Chocolate cream):
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250 g unsalted butter, softened
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250 g icing sugar
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5 medium eggs (yolks + whites separated)
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2 sachets vanilla sugar (16 g total) or 2 tsp vanilla extract
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200 g dark cooking chocolate (50–70% cocoa)
Decoration:
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100–150 g extra dark chocolate (optional, for glaze)
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A few walnut halves or grated chocolate
Preparation:
Step 1 – Caramel with walnuts
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Put 400 g sugar in a heavy pan over medium heat. Leave to melt until it turns golden (don’t stir too much to avoid crystallising).
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Stir in walnuts quickly.
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Pour the hot mixture onto a tray lined with baking paper or lightly greased. Leave to harden.
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Once cool, crush into fine crumbs with a rolling pin or food processor.
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Divide into portions: set aside ⅓ for the cake sponge. Split that ⅓ in half (each half will go into one sponge). The remaining ⅔ will go into Filling 1.
Step 2 – Sponge layers (biscuit)
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Preheat oven to 200°C (180°C fan) / 390°F. Line a 24–26 cm (9–10 inch) round tin with baking paper.
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Separate 6 eggs. Beat the whites until stiff, gradually adding 75 g sugar.
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Lower mixer speed, add yolks one by one.
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Fold in flour and half of the reserved caramel crumbs. Mix gently.
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Divide batter in half. Bake two sponges separately, 12–15 minutes each, until golden and springy.
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Once cool, slice each sponge horizontally in half = 4 thin layers.
Step 3 – Syrup
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In a small saucepan, combine sugar and water. Heat gently until sugar dissolves.
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Remove from heat. Stir in brandy.
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Cool completely before brushing onto sponges.
Step 4 – Filling 1 (Caramel cream)
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Beat softened butter and icing sugar until creamy.
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Add egg yolks one at a time, mixing well.
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Fold in the remaining ⅔ caramel crumbs.
Step 5 – Filling 2 (Chocolate cream)
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Beat butter and icing sugar until fluffy.
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Add 5 yolks, one by one.
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Whip the 5 whites into stiff peaks and fold gently into the mixture.
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Melt 200 g chocolate over a bain-marie or in the microwave (short bursts). Let it cool until just lukewarm.
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Stir chocolate and vanilla sugar into the cream.
Step 6 – Assembly
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Place first sponge on a plate. Brush with syrup. Spread Filling 1.
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Add second sponge. Brush with syrup. Spread Filling 2.
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Add third sponge. Brush with syrup. Spread Filling 1.
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Add fourth sponge. Brush with syrup. Cover top and sides with Filling 2.
Step 7 – Decoration
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Option A: Melt extra chocolate with a knob of butter, pour as glaze.
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Option B: Sprinkle grated chocolate, walnut halves, or leftover caramel crumbs.
Step 8 – Rest
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Cover loosely with clingfilm and refrigerate for 24 hours minimum before slicing.
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This lets the sponges soak the syrup and fillings, creating the authentic soft texture.
Extra Tips
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Caster sugar is best for sponge; it dissolves quicker than granulated.
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Use unsalted butter for the fillings. Bring it to room temperature before whipping.
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Cooking chocolate = supermarket dark chocolate (50–70%). Brands like Lindt or Green & Black’s work well.
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If you want a lighter texture, replace half the walnuts with hazelnuts.
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