Roast ChestnutsCut an 'X' into the flat side of each chestnut shell.Place chestnuts in a single layer on a sheet of baking paper and roast in your oven at 180 degrees for around 15 minutes, (stiring around after 10 minutes) until the shell starts to peel back (the more they are curled back the easier they will be to peel).Let cool for 5 minutes and then peel the shells off.PureePut peeled chestnuts, sugar and water into the Thermomix bowl and cook at 100 degrees speed 1 for 25 minutes.Stir in vanilla on speed 1 for 10 seconds.Strain the chestnuts using the TM basket collecting the liquid into a separate bowl. Set liquid aside.Mill chestnuts for 30 seconds speed 7 or until a smooth paste. Add reserved liquid gradually until the desired puree consistency is reached mixing speed 4.