For the yogurt foam, pour 6 tablespoons of water into a purederl. Stir in gelatine and heat, do not boil.
Stir gelatine until smooth. Mix with yogurt, eggnog and sprinkle sweetener, stir well and pour into 4 ramekins (small plastic cups).
Refrigerate for at least 2 hours. Arrange the fruit on a plate and serve the yogurt foam.