Heat the water with the sugar (1) to 50°C and mix the pectin with the sugar (2).
Add the pectin mixture to the water and blend with a hand mixer.
Heat the mixture to 85°C and add the lemon juice, pistachio paste, and Debic Vegantop.
Cover with cling film and store in the refrigerator for 24 hours before use.
Heat the mixture to 35°C and pour over the pastries.