Han
boil till they are al dente (never cut a cross in the bottom)then mash, mix crushed chesnuts and add a spoon of fresh cream stir and sprinkle cut up smoked crispy bacon on top.
Hmmmmmmmmm!
or try boil as above rinse in cold water till needed then a quick fry in duck fat.
NEVER let them go soggy and always buy on the stalk (if you don't grow them);)