4: Next add the softened gelatin (after draining well). Mix until fully melted, then leave the mixture at room temperature to cool for about 30 minutes.
5: Lay a tea towel on a baking sheet and stand the small glasses on this (to stop them sliding about). Divide the mixture between the glasses, then refrigerate for at least 2 hours.
6: Meanwhile, put 60 g pistachios in a small frying pan on high heat and toast for about 5 minutes (they should only colour slightly).
7: Add 40 g caster sugar to the pan and caramelise the pistachios.
8: When they are well caramelised, tip the nuts out onto the worktop (or onto a sheet of cooking parchment if you prefer) to cool.
9: When cold, chop coarsely with a knife.
10: When you are ready to serve, take the panna cotta out of the fridge and add a little custard to each glass.
11: Finish with a few chopped caramelised pistachios and serve.
Remarks
Get pistachios without skin if possible; they look so much nicer when caramelised.