Soak cranberries in wine. Wash sage, dab dry. Heat 3 tablespoons of oil. Fry sage briefly. Remove from heat.
Peel and chop the onion. Celery peel, wash and cut into large pieces. Heat 1 tablespoon of oil in a large pot. Fry the onion until transparent. Fry the celery and chestnuts briefly. Sprinkle 1 tbsp. sugar over them and caramelise until golden.
3⁄4 l Pour on water, bring to the boil and stir in the stock. Cover and simmer for 25-30 minutes.
Roughly chop the cashews. Roast in a pan without fat until golden brown. Add the cranberries and red wine and simmer until the red wine has evaporated. Season with salt, pepper and 1 pinch of sugar.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper. Spread 4 slices of ham with egg white. Put 1 tsp. cranberry mixture on each slice in 2 heaps.
Cover with 1 slice of ham each. Press down very well around the filling and cut into 2 triangles each. Place Wan Tans on the tray. Bake in a hot oven for about 8 minutes, turning once.
Finely puree the soup with a hand blender. Whip the cream until semi-stiff and stir in, except for 2 tbsp. If the soup is too creamy, add some more water. Season soup with salt and pepper. Serve with the rest of the cream and sage and oil.
Wan Tans.