In a large pot, on medium heat, combine water and sugar and stir until dissolved. Add lemon juice, rose water and orange blossom water and let boil until thick like a syrup. In a saucepan melt butter on medium heat and then add farina and semolina and cook for 2 minutes, then add to syrup and pot and let cook for 2 minutes. Next add the mozzarella to the pot and stir vigorously with a wooden spoon until cheese is melted and well combined with the farina/syrup mix. Immediately pour cheese onto a flat surface or baking sheet that is coated with simple syrup, thin the cheese out with a spoon or with a marble rolling pin until it is 1/8 inch thick and then let cool completely. Cut cheese into 3 or 4 inch squares, fill with custard and roll up, place on a plate and refrigerate for at least 2 hours. When ready to serve, top with ground pistachio and simple syrup.