Cut the vanilla pod open lengthwise with a sharp knife and scrape out the pulp. Mix yoghurt, sugar and vanilla pulp. Put the mixture in the freezer for 1 1⁄2 for 2 hours. Whisk through with a whisk every 15-20 minutes.
Peel the mango. Cut the flesh from the stone and cut into small cubes. Divide mango cubes into four dessert glasses. Coarsely chop the pistachios.
As soon as the frozen yoghurt has a creamy, dimensionally stable consistency like soft ice cream, pour the mixture into a piping bag with a large star-shaped spout. Spray the frozen yoghurt onto the mango as thick tuff.
Sprinkle with pistachios and sprinkle with some honey. Serve immediately.