1. Preparing the Springform Tin:

Start by greasing a 22cm round springform tin with cooking oil spray. It’s crucial to line both the base and sides of the tin with baking paper, which will ensure that the semifreddo doesn’t stick to the sides and can be easily removed once frozen. This step guarantees a smooth presentation and helps retain the perfect shape when you serve it.

2. Melting the Chocolate Mixture:

In a large heatproof bowl, combine the dark chocolate, sifted cocoa powder, and half of the thickened cream. Set the bowl over a saucepan of simmering water, making sure the bowl doesn’t touch the water. Stir the mixture occasionally until the chocolate is completely melted and the mixture is smooth. Once melted, remove the bowl from the heat and set it aside to cool slightly. This will serve as the rich chocolate base for the semifreddo.

3. Whisking the Cream:

In a separate large bowl, pour the remaining thickened cream. Using a hand mixer or a stand mixer, whisk the cream until soft peaks form. Be cautious not to over-whisk, as you want the cream to be fluffy and airy but not too stiff. Soft peaks mean that when you lift the whisk, the cream will form peaks that bend over slightly at the tips. This whipped cream will provide the light, airy texture that makes semifreddo so irresistible.

4. Whisking the Eggs and Sugar:

In the bowl of an electric mixer, combine the eggs, egg yolks, and vanilla bean paste. Whisk on high speed for about 3 minutes or until the mixture becomes thick and pale. This process is essential, as it helps to create the light, fluffy structure of the semifreddo. You should be able to form ribbons when you lift the whisk from the mixture.

5. Making the Sugar Syrup:

Next, in a small heatproof bowl, combine the caster sugar and water. Set the bowl over a saucepan of simmering water. Stir occasionally until the sugar dissolves. Once the sugar has dissolved, let the mixture cook for another 3 minutes until it reaches a syrupy consistency and a temperature of 117°C on a sugar thermometer. The syrup should be clear, not colored, and should have a thick consistency. If you don’t have a thermometer, you can check the syrup by dripping a small amount onto a cold plate and seeing if it sets into a thick, sticky texture.

6. Incorporating the Sugar Syrup:

Once the sugar syrup has reached the correct consistency, carefully pour it into the egg mixture in a slow, steady stream while whisking constantly. This will help incorporate the syrup into the eggs without curdling them. After all of the syrup is added, continue whisking for an additional 8 minutes or until the mixture is thick, glossy, and cooled to room temperature. The goal is to create a smooth, shiny mixture that will provide structure and stability to the semifreddo.

7. Combining the Chocolate Mixture:

Now, gently fold the cooled chocolate mixture and the whipped cream into the egg mixture. Use a spatula to carefully fold the ingredients together until well combined, being careful not to deflate the mixture. The goal is to maintain as much air in the mixture as possible to ensure the semifreddo has its signature light texture.

8. Chilling the Mixture:

Once the mixture is fully combined, refrigerate it for 30 minutes to allow it to thicken slightly. This helps the semifreddo hold its shape better when you fold in the raspberries and honeycomb. It also helps the mixture firm up slightly, so the components stay intact.

9. Folding in the Honeycomb and Raspberries:

After the mixture has chilled, gently fold in the chopped honeycomb and frozen raspberries. The raspberries will add a burst of tartness and color, while the honeycomb will provide a delightful crunch. Be careful while folding, as you don’t want to crush the raspberries or break the honeycomb into too small pieces. The goal is to keep the texture intact, as it adds a nice contrast to the smoothness of the semifreddo.

10. Freezing the Semifreddo:

Spoon the mixture into the prepared springform tin, smoothing it out with a spatula. Once it’s evenly spread, cover the tin with plastic wrap and place it in the freezer. Let it freeze overnight (or at least 6 hours) to ensure that it sets properly and reaches the perfect consistency. The semifreddo should be firm but not hard, with a creamy, mousse-like texture.

11. Making the Chocolate Ganache:

While the semifreddo is freezing, prepare the chocolate ganache. Place the chopped dark chocolate in a large heatproof bowl. Heat the cream in a small saucepan over medium heat until it just begins to simmer. Pour the hot cream over the chopped chocolate and stir until the mixture is smooth and well combined. Stir in a tablespoon of water to thin the ganache slightly, making it easier to drizzle later. Let the ganache cool in the refrigerator for about 15 minutes, or until it thickens to a pourable consistency.

12. Finishing the Semifreddo:

Once the semifreddo has frozen and set, carefully remove it from the springform tin. To decorate, press the finely chopped chocolate biscuits onto the sides of the semifreddo. This will create a beautiful, textured exterior. Place the semifreddo on a cake stand or serving plate. Top it with the extra whipped cream, and drizzle the cooled chocolate ganache over the top. For the finishing touch, decorate with fresh raspberries, broken honeycomb shards, and dark chocolate curls. These final touches not only enhance the flavor but also create an eye-catching presentation.