Wash the mangoes properly.
Take a pressure cooker and add mangoes into it. Now pour water of sufficient quantity and close the lid.
Put the cooker on high flame until 2 whistles.
Now switch off the flame and keep the pressure cooker aside for cooling down.
Now take a pan and add sugar and water in it.
Put the pan on a flame until the sugar melts. Discard the impurities, if any, you find floating on the surface of the syrup. Do remember, you just have to melt the sugar and not to boil the water to make a thick syrup/chashni.
Keep it aside also for cooling down.
Now open the lid of the pressure cooker and bring out the mangoes.
Take out the pulp from the mangoes and discard the skin and seeds of mangoes.
Transfer the pulp in a blender and blend to smooth puree.
Now take a big bowl, add mango puree and sugar syrup and mix it properly.
Your Mango Frooti is ready. Fill it in the bottle and place the bottle in the refrigerator.