Mix all the ingredients, fill a piping bag and poach on the cookie. Add pieces of marron glacé and poach a little chestnut cream. Keep in the freezer until ready to assemble.
Fill silikomart mould with vanilla mousse. Add the chestnut-covered cookie. Top with mousse and finish with praline crunch. Place in the freezer overnight.
Prepare the mirror glaze and store in a cool place.
The next day, remove the log from the freezer, unmold and immediately apply the mirror icing when it reaches around 35-36°C.
I decorated with two dark chocolate log ends, marrons glacés and edible gold powder.