Buche De Marrons Au Chocolat

• 3 calvados
• 3 applejack
• 3 chestnuts for (whole garnish)
• 1,600 gr chestnuts
• 575 gr chestnuts
• 280 gr chocolate
• 240 ml cream
• 150 gr powdered sugar (very finely)
• 65 gr butter
• 50 gr sugar