Soak gelatine in cold water. Chop the couverture, melt in a warm water bath while stirring. The water bath should not be too hot, as white couverture curdles quickly.
Separate eggs. Refrigerate the egg whites. Beat egg yolk and sugar with a hand mixer in a hot water bath for 5-6 minutes until light creamy. Quickly stir in the liquid chocolate coating with a whisk.
Squeeze the gelatine well and dissolve at very low heat while stirring. Stir with 2-3 tablespoons of cream. Then immediately stir evenly into the rest of the cream with a whisk.
Whip cream and egg whites separately until stiff. First fold cream, then beaten egg whites into the chocolate cream with a whisk. Cover the mousse with foil and chill for at least 4 hours.
Peel the orange so that the white skin is completely removed. Cut into slices. Cut the pomegranate in half. Tap the peel with a spoon vigorously so that the seeds fall out.
Wash the carambola and cut into thin slices. Bend the sheaths of the physalis apart. Cut the mousse into cams with an ice-cream scoop or tablespoon. Serve with fruit.