Cut oranges in half. Remove the pulp. Press through a sieve. Collect the juice. Freeze the oranges. Wash the mint, pluck off the leaves and chop finely. Soak gelatine in cold water.
Beat the egg yolks and sugar in a hot water bath with the whisks of the hand mixer until the mixture is light yellow and creamy. Then beat again until cold. Season to taste with 4 tablespoons of orange juice, lemon juice and mint.
Squeeze gelatine vigorously, dissolve and stir into the mixture. Put it in a cold place until it begins to set. Whip the cream until stiff. Fold into the egg yolk mixture. Then fill into a piping bag with star-shaped spout, squirt into the orange halves and freeze gently.
Serve well chilled and decorated with orange peel and mint leaves.