• Cook the chestnuts according to your favorite method or the instructions on the package (I prefer to cook them in a pressure cooker for 15 minutes).
• Mix them in a blender to get a puree (more or less smooth according to your taste, I like it when there are still little pieces left). Set aside and let it cool down.
• Whip the butter with the confectioner's sugar and the salt.
• Add the chestnut puree to the butter/sugar mixture. Mix until you obtain a homogeneous cream (if necessary use a hand mixer as it will be dense).
• Mold the mixture into a cylinder shape, or place it in a log (or other) mold. Set aside and prepare the glaze.

Chocolate glaze

• In a pan, melt the chocolate and butter over low heat.
• As soon as the mixture is melted, pour it over the log. You can draw some lines with a fork for decoration [to represent a log] and add some glazed chestnut pieces. Keep the log in the fridge and take it out about 30 to 60 minutes before serving.