In a small bowl, sprinkle gelatin over remaining orange juice and let stand 2 to 3 minutes, until softened. Set bowl of gelatin in a saucepan of hot water and stir until dissolved. Beat egg yolks into cooled chocolate mixture. In a bowl, whip cream and sour cream, In a separate bowl, whisk egg whites until stiff. Fold whipped creams, then egg whites into chocolate mixture and chill until almost set.
Spoon mousse into chocolate cups and refrigerate until mousse has set.
Top with fresh fruit. Peel away paper cuts before serving.