Step 1

Position the oven racks in the upper, middle, and bottom part of the oven, then set the oven to preheat to 150 °C. Line three 21 cm round baking pans or trays with parchment paper or, if you are using trays, draw a 21 cm diameter circle on each. Set aside.

Step 2

In a small bowl combine hazelnuts, 100 grams of caster sugar, and cornflour. Whisk egg whites with a pinch of salt at medium speed for 2 minutes. Increase the speed to high, and with the mixer running, gradually add 200 grams of sugar until stiff glossy peaks. Fold the hazelnut mixture into the meringue.

Step 3

Spoon the meringue into a piping bag fitted with a 1.5 cm plain tube. Pipe a spiral of meringue starting from the center of each drawn circle and working outwards. Bake for an hour, rotating the upper and bottom baking tray after 30 minutes, so they cook evenly. Turn off, and leave the meringues to cool down in the oven with the door slightly open.

Step 4

To make chocolate ganache, place the chopped chocolate in a heatproof bowl. Heat the cream until hot, just simmering, but not boiling and pour over the chocolate. Let sit for a minute and then stir until smooth. Cool to room temperature, then refrigerate until it thickens. Fill the piping bag fitted with a medium star nozzle with ganache and set aside.

Step 5

To make the custard, bring the milk to a boil over low heat. Whisk the egg yolks, sugar, and coffee and chicory essence, then whisk in the cornflour, a tablespoon at a time. Pour the hot milk over the egg mixture, whisking continuously, then pour the mixture back into the pan. While constantly whisking, bring to a boil, then decrease the heat, and let it simmer for 2-3 minutes until thick and smooth. Remove from the stovetop and wait an hour for it to cool. Once the custard is chilled, fold in softly whipped cream.

Step 6

Whip the cream until soft peaks. Whisk half of the whipped cream into the cold coffee mixture, then gently fold in the rest. Cover and chill until needed.

Step 7

Melt sugar in a small frying pan (without stirring). Cook until golden caramel color, or until a thermometer registers 300°C. At that point add the whole hazelnuts and lemon juice, and stir with a wooden spoon until well blended. Pour the mixture onto a baking tray lined either with baking paper or silicone. Using two teaspoons form 12 pieces of hazelnut praline. Wait for it to cool completely before use.

Step 8

Position one meringue layer on a large serving plate, then in an even layer, coat it with one-third of the coffee cream. Place a second meringue layer on the cream to cover, then spread the top part with half of the coffee cream. Top with the third meringue layer, coat the sides of the cake with the coffee cream. Press roasted and chopped nuts into the sides of the cake. Pipe 12 swirls of the ganache onto the top outer edge of the cake, taking care they are evenly spaced, then place a piece of praline on each.