Hold the bottle of Cheesecake under hot water for at least 20 seconds to loosen the contents from the bottle.
Empty the bottle into the bowl of the planetary mixer and beat with the whisk for 5 minutes at full speed until light and airy.
Add the pistachio paste and salt and mix well.
Transfer the mixture to a smooth-nozzled piping bag and fill the cake rings.
Smooth out with a palette knife and leave the cakes to set in the refrigerator for at least 2 to 4 hours.