Soak gelatine in cold water for about 5 minutes. Cut the vanilla pod lengthwise and scrape out the pulp. Cut nougat into small pieces. Bring milk, cream, sugar, vanilla pod and pulp to the boil in a pot.
Remove the pod, add the nougat and stir until the pieces have dissolved. Take the pot off the heat. Squeeze out the gelatine and dissolve in the nougat cream while stirring. Pour into four small moulds (each containing approx. 175 ml) and chill for at least 4 hours, preferably overnight.
Peel the mango and cut it into wide strips from the stone with a peeler. Mix lime juice and 1 teaspoon brown sugar. Wash mint, shake dry, pluck off leaves and cut into fine strips.
Mix mango, lime juice and mint leaves and marinate.
Remove the panna cotta from the moulds and turn out onto a plate, arrange the mango salad around the panna cotta and sprinkle with 1 tsp. sugar.