In a bowl, mix the powders together: 65g flour, 65g caster sugar and a little vanilla powder. Add 1 egg, liquid vanilla and 20g melted butter. Mix well. Beat the two egg whites with an electric mixer.
Take a small portion of the egg whites and mix with the powders to loosen the mixture. Add the remaining egg whites, stirring gently with a spatula.
Pour the mixture onto a baking tray lined with baking paper. Smooth with an angled spatula to ensure an even layer. Crumble in pieces of marrons glacés.
Bake in the oven at 170°C for 15-16 minutes.
Leave to cool, then cut a 12x12cm square to fit your pastry frame.
Place the biscuit at the bottom of the frame.
Chestnut mousse 50g single cream 180g chestnut cream 100g single cream 3.5g gelatine
Add the gelatine leaves to a large bowl of cold water. Heat 50g of single cream in a saucepan. Remove from the heat and add the softened gelatine.
Pour over the chestnut cream. Mix well. Set aside. Whip the remaining 100g of cold single cream with an electric mixer. Gently fold into the previous mixture when it is below 30°C.
Pour into the pastry frame over the biscuit, leaving 2 to 3 mm for the icing. Place in the freezer overnight.
Mirror glaze 33g white chocolate 33g sugar 33g glucose 18g water 3g gelatine 22g liquid cream 22g chestnut cream
In a tall container, add 33g of white chocolate and melt in the microwave.
Place the gelatine leaves in a large bowl of cold water. In a saucepan, heat 33g caster sugar, 18g water and 33g glucose to a rolling boil.
Remove from the heat and add the gelatine, wrung out and softened. Pour this mixture over the melted white chocolate. Stir well. Finally add the 30% fat liquid cream and the chestnut cream. chestnut cream. Use an immersion blender to blend the mixture thoroughly.
Be sure to tilt the bowl when you put the mixer in to incorporate as little air as possible. Also run your mixer at low speed to limit the formation of bubbles.
Remove the cake from the freezer. Immediately cover the surface with the icing to 34/35°C.
Place in a cool place until the glaze sets. Carefully remove the frame.