Heat the oil, sauté the chestnuts and leek for approx. 4 mins., pour in the wine and reduce to half the amount. Pour in the water, bring to the boil, reduce the heat, cover and simmer for approx 15 mins. until soft. Blend the soup, season.
Heat the oil in a non-stick frying pan, gently fry the ham until crispy, add the reserved leek and maple syrup and continue to sauté for approx. 3 mins. Arrange the crispy ham mixture with the cream on the chestnut & leek crème.