Blackberry Trompe L’Oeil Cake

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To look upon this creation is to be deceived by the most exquisite lie. Resting on the plate, it is not a cake but a perfect, dew-kissed blackberry—a giant plucked from a fairy-tale bramble, its aggregate of velvety drupelets catching the light like faceted jewels of deep violet and midnight purple. This is the art of trompe l'oeil: a culinary magic trick where the eye believes one truth, and the palate discovers another, infinitely more complex and delightful. But the deception is merely the threshold of the experience. The true journey begins with the first crack of your spoon against its seemingly fragile skin. Beneath that illusion of a single fruit lies a symphony of textures—blackberry and coconut in perfect harmony. Whether you are a seasoned professional or an enthusiastic home cook, this recipe will guide you through every tour de main, sharing the professional techniques you need to achieve this beauty flawlessly.

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Is that one the ultimate raspberry cake?

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Let the cake thaw in the fridge for 15-18 hours before enjoying it.

Raspberry Trompe L'Oeil Silicone Mold

Raspberry-shaped silicone molds are here used for blackberry trompe l'oeil cakes. A wide range of options can be found online. These can be found online in various styles: a 6-cavity sheet mold for smaller, bite-sized illusions, or a 12 cm diameter individual mold designed with a bottom foot for stability—perfect for a dramatic, standalone centerpiece. For reference, I purchased my silicone molds from Déco Relief; they measure 4.7 inches (12 cm) in diameter and have a combined filling capacity of 600 grams for one finished cake mold.
And don't forget, when you end up having leftovers, it will always be saved to make Grab&Go dessert cups!
Example: Coconut ganache montée, coconut dacquoise scraps, red fruit coulis, blackberry mousse...

Blackberry Insert

Soak the gelatin sheets in ice water until softened, then drain and squeeze out the excess water. In a medium-sized saucepan, heat the blackberry purée and the sugar mixed with the pectin over medium-low heat. When it boils, cook for 2 minutes. Add lemon juice and remove from the heat.
With the whisk, incorporate the bloomed gelatin and then the fresh red fruits.
Fill the half-sphere silicone molds (3.5 oz / 100-130g max per cavity, per cake). Freeze for at least 6 hours before unmolding. Remove the frozen raspberry inserts from the molds and keep them in the freezer.

Coconut Dacquoise

Grease and line the rimmed baking tray with parchment. In the stand mixer fitted with the whisk attachment, beat the egg whites, cream of tartar, and white sugar on medium speed keeping the mixture on the foamy stage. Meanwhile, lightly toast the shredded coconut in a skillet or in the oven. In the food processor, pulse the powdered sugar and almond meal. Transfer powders into a bowl and then combine with the toasted coconut.
Set your fan oven to 340ºF (170°C). Increase the mixer speed to high and beat until stiff peaks form.
Stop the mixer and fold in the dry ingredients.
Spread the coconut dacquoise mixture into the prepared baking tray.

Baking

Bake coconut dacquoise for 12-15 minutes. Let cool and freeze. Top the biscuit with parchment, flip it and remove the parchment. Cut into desired size discs, and freeze. Save leftovers for future desserts.

Coconut-Vanilla Ganache Montée

Soak the gelatin sheets in ice water to soften, then drain and squeeze out the excess water. Meanwhile, melt white chocolate over a bain-marie on a gentle heat. Remove from the heat once just melted.
In a saucepan, bring to a quick boil coconut cream, heavy cream and vanilla. Remove from the heat and pour over the melted white chocolate. Blend with the an immersion blender.
Add in the bloomed gelatin, blend and then add the remaining chilled heavy cream. Mix well and refrigerate the ganache montée overnight to set completely before whipping. Whip ganache montée right before using it.

Blackberry Mousse

Soak the gelatin sheets in ice water until softened, then drain and squeeze out the excess water. Heat the blackberry puree with the sugar to about 140°F (60°C). Remove from the heat and whisk in the bloomed gelatin. Transfer the fruit puree to a large bowl and let it cool to 95ºF (32-35°C).
Whip the chilled heavy cream to medium-soft peaks (keep it supple).
Fold the whipped cream into the tempered blackberry puree with the whisk. Don't clean the mixing bowl and whisk, transfer the chilled coconut ganache montée into it and keep refrigerated. It will be used next.

Cake Assembly

Fill each silicone mold with the blackberry mousse to 60% capacity (300g). Gently tap and massage the mold.
Add the blackberry insert and gently push it down (dome side down). Avoid refrigeration for now.
Whipping ganache montée: Whip ganache montée to soft peaks. Avoid over whipping otherwise it wont spread well into the silicone mold. So, stay close to your stand mixer!
Immediately, pipe a generous rope of ganache montée all around the sides of the mold and in direct contact with the blackberry mousse. Gently tap the mold, then use a tablespoon to lift the mousse upward, ensuring the drupelet cavities are completely filled. Add more filling if necessary.
Add a layer of crumble (crush it into small pieces), and top with more coconut ganache montée, almost up to the top (leave a little room for the dacquoise).
Lastly, pipe a dollop of filling and enclose each cake with a coconut dacquoise disc. Freeze cakes overnight or for up to 3 months. Demold the cake the day it will be glazed.

Chablon

Chablonner is a technique consisting of thinly coating the bottom of a cake with a mixture of melted dark chocolate and oil. It is meant to seal and strengthen the base. It can be done before freezing the cake or after. This step is optional.

Demolding

To unmold a frozen cake assembled in a silicone mold, invert it onto a frozen baking tray. Once unmolded, return the cake to the freezer until you are ready to glaze it.

The Finishing Touch

To finish the cake, follow the chocolate spray tutorial. To mimic the very dark purple color of a blackberry, add blue food coloring to the red (raspberry chocolate spray mixture) until the desired tone is obtained. Mine is still a little too clear/light, though.

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