Peel mangoes, cut into cubes, put into a saucepan. Add orange juice, juice of one lemon and sugar, boil, make 3 min, mash. Soak the gelatine, squeeze it, let it melt in the compote, let it cool down until it starts to gel.
Whip the egg whites with a little salt until stiff, fold into the cream and leave to cool for 1 hour.