Soak the gelatine in cold water. Cut the vanilla pod lengthwise and scrape out the vanilla pulp. Cut nougat into small pieces. Bring milk, cream, sugar and vanilla pulp to the boil in a pot.
Add the nougat and stir until the pieces have dissolved. Squeeze the gelatine, add to the mixture and dissolve in it while stirring. Pour the panna cotta mixture into 4 small moulds (each containing approx. 175 ml) and chill for at least 4 hours.
Wash and peel the mango and cut into wide strips with a peeler. Squeeze lime, add 1 teaspoon of brown sugar. Wash mint leaves, dab dry and cut 2 mint leaves into fine strips.
Pour lime juice and mint leaves over the mango and marinate.
Remove the panna cotta from the moulds, place on a plate, arrange the mango salad around the panna cotta, sprinkle the remaining sugar on top and decorate with mint leaves.