Grate the peel from the organic lime. Squeeze the limes. Whip lime juice with egg yolk, egg and 125 g sugar in a metal bowl in a hot water bath until thick and creamy. Place bowl in cold water, whip cream until cold.
Coarsely chop the walnuts. Cut the mango off the stone. Peel flesh and cut into thin slices. Wash the carambola and cut into slices. Separate the pineapple from the skin, quarter the flesh and cut into pieces.
Remove the pomegranate seeds from the white parting skins. Remove the cover of the physalis. Wash and halve the physalis.
Arrange the fruit and lime foam in small bowls or on dessert plates. Sprinkle with walnuts and lime peel.