In a pan, add 1 liter of milk and bring it to a boil.
Now add ¼ cup of powdered sugar and mix well.
Then add ½ cup of sevai to the boiling milk and mix well. Stir continuously, and let the sevai cook properly for 4-5 minutes.
Meanwhile, in a mixing bowl, add 1 tbsp of custard powder and ½ cup of water. Mix well.
Then add the custard powder mixture to the boiling milk and mix well.
The milk mixture will start to thicken. Switch off the gas and transfer the mixture to a mixing bowl.
Let it cool down. Add 2 tbsp of almond slits, 2 tbsp of pistachio slits, soaked sabja seeds, and 6 tbsp of rose syrup. Mix well.
Falooda sharbat is ready. Refrigerate it for 2 hours.
Serve chilled falooda sharbat topped with vanilla ice cream, tutti-frutti, and pistachio slits.