2. Remove the seeds from the cardamom pods and crush them using a pestle and mortar – you will need 1 tsp of ground cardamom.
3. Lift off and discard the top layer of paper from the yogurt, then scrape the yogurt into a bowl and stir in the sugar. Mix the saffron strands with the milk, then add the lot to the yogurt with the ground cardamom. Give the yogurt mixture a good stir for a few minutes so the ingredients are well mixed. (You can make up to this stage a day ahead and keep covered in the fridge.)
4. Divide between 6 small glasses and scatter over the pistachios. Stand each glass on a saucer with some fresh mango slices on the side and serve at room temperature.