In a saucepan, mix the water and sugar together and bring to the boil.
Simmer for about 5 minutes.
Add the lemon juice and orange blossom water.
Remove from the heat and leave to cool.
Baklava snails
Preheat the oven to 200 °C.
Put the walnuts in a blender and chop them finely. Not too finely - small irregular pieces should still be visible.
Mix the fine walnuts with 1.5 tbsp sugar, cinnamon and cardamom.
Lay out the puff pastry and spread the walnut mixture and 1/4 of the pistachios on top. Leave about 2 cm on the sides. Drizzle the nut mixture with a few pinches of water (2 tbsp).
Now carefully roll the puff pastry into a roll and cut approx. 2 cm wide slices from it.
Lay out the slices on a baking tray lined with baking paper with sufficient space between them.
Bake the baklava snails for approx. 15 minutes.
After baking, baste the still hot snails with 2 tsp sugar syrup each and sprinkle with the remaining chopped pistachios.