Firstly wash then boil water chestnut in plenty of water(water level should be up from the level of singharas, they should dip completely in water)..when came to a boil slow down the heat and cook fo' five minutes more and flame off(don't over cook the water chestnut as it's natural crunch will be removed)..let it to dip in boiling water fo' a while as cookin' process continous inside even after switch off the flame

Put out of water and peel off the skin of singharas