Preheat the oven to 150 C / Gas 2. Line a baking tray with parchment paper.
Gradually fold 1/2 the sugar into egg whites. Beat well, then add remaining sugar mixed with cream of tartar.
Combine the cornflour, vanilla essence and vinegar in a small bowl. Fold into beaten egg whites. Mound mixture onto the centre of baking tray.
Bake in the preheated oven for 2 hours. Then increase the temperature to 190 C / Gas 5 and continue to bake until golden, 5 to 10 minutes longer. Remove from the oven and allow to cool for at least 2 hours.
To prepare the filling, combine whipped cream, walnuts, ginger, jam and nutmeg. Spoon into cooled meringue and decorate with cherries.