Soak the gelatine in cold water. Wash limes hot and dab dry. Finely grate the peel from one, peel the other thinly and cut into fine strips. Squeeze 3-4 limes and measure approx. 100 ml juice
Separate eggs, chill egg whites. Beat egg yolk, sugar and rum for approx. 5 minutes until creamy. Stir in yoghurt, lime juice and grated zest. Squeeze out the gelatine and dissolve at low heat. Stir in 4 tbsp. yoghurt, then stir into the remaining yoghurt. Chill until the mixture is semi-solid
Beat the egg whites and cream separately until stiff, fold in. Pour the cream into 6-8 glasses or a large bowl. Chill for at least 4 hours
Drain the mango and puree it, except for a few slices. Cut 1 lime into slices. Decorate the cream with brown sugar, lime strips, slices and sauce with mango wedges