Heat the diced pears with the vanilla in a saucepan. In a small bowl, mix the powdered sugar and NH pectin. As soon as it starts to boil, pour over the diced pears and cook for 2 minutes, stirring constantly. Set aside until ready to assemble.
Melt the white chocolate in the microwave. Add the crumbled crêpes dentelles and speculoos paste. Mix gently. Roll out between two sheets of baking paper and place in the freezer. Remove from the freezer and cut out using a cookie cutter the same diameter as your mould. Place in the freezer until ready to assemble.
Soften the gelatine sheet in a bowl of cold water. Heat the 50g of single cream with the speculoos paste in a saucepan. Remove from the heat and add the drained and softened gelatine, stirring well. Set aside.
Whip the very cold single cream (minimum 30% fat) with an electric mixer. Add the previous mixture. Fill a piping bag with this mousse and set aside for assembly. Quickly make the pear mousse.
Soften the gelatine sheet in a bowl of cold water. Heat the pear purée (blended ripe pears or blended pears in syrup) in a saucepan for a few minutes over a low heat so that the water evaporates a little. Remove from the heat and add the drained and softened gelatine, stirring well. Set aside.
Whip the very cold liquid cream (minimum 30% fat) with an electric mixer. Add the warm pear purée. (T<approx. 30°C so that the whipped cream does not collapse).
Fill your Silikomart mould halfway with pear mousse, making sure it covers all the edges.
Poach the speculoos mousse.
Add the pear compote.
Top with pear mousse.
Finish with the crispy speculoos biscuit.
Place in the freezer overnight or for at least 6 hours. The next day, remove your desserts from the moulds.
Dressage
Place your dessert on your serving plate. I sprinkled some speculoos powder made from crumbled biscuits.
I decorated my plate with a quenelle of Faur ice cream moulded using a Silikomart quenelle mould.