Heat oven to 350°F/180°C. Line a baking sheet with baking paper or a baking mat.
Blitz the pistachio nuts to a fine texture.
Separate egg whites from yolks. Whip the egg white until it forms a stiff peak.
Add 1 tablespoon at a time of sugar and beat for a few minutes before adding the next. Whip until thick and glossy.
Gently fold in cocoa powder, cornstarch, vinegar and nuts. Don't overbeat but rather fold in gently with a metal spoon.
Add the mixture to the center of the lined baking tray and create a hollowed out shape.
Bake for 5 minutes. Turn the oven down after 5 minutes to 250°F/120°C and bake for 1 hour 15 minutes.
Cool completely and very carefully transfer to a plate. If you are nervous to transfer it, just serve it on the baking paper.
Whip up the cream until stiff and fold through the yogurt.
Top with all your bits and serve in the middle of the table for some DRAMA!
Video
Notes
These toppings are optional, you can use any fresh fruits, nuts or even chocolate shavings on this pistachio pavlova. Think raspberries, blackberries, finely cubed mango, kiwi, cherries... the important part is to experiment and have fun!