In grinder, add bread slice and grind it well. Set aside.
In a medium size pan, add milk and bring it to boil nicely. Nowadd grind bread slices and mix well. Keep cooking and stirring whole time on medium flame until get thicke n. When milk get thicken, take out in a jug and set aside for later use.
Now clean the pan, add ½ milk, sugar, cardamom powder, nuts and mix well until get boil on low frame for about 8 minutes. Keep stirring and mixing them well in-between of boiling.
Soak saffron in a tablespoon of warm water and add it to the reduced milk and keep stirring for 5 more minutes.
Turn off the flame, add prepared thick milk mixture, give a good mix until get combined and set aside.
Dip clay pots or mud pots in water for about 2 hours.
Place a large clay pot directly on the flame, pour cooked kulfi mixture ,and being it to boil then take out in a bowl gently.
Repeat the same process with the remaining mixture until get all Kulfimixture boiled in the pot.
Pour the kulfi mixture gently into glass clay pots and it cool. I made 19 clay pots glasses, you can make of your choice.
Cover pots with aluminum foil or simply with any cap for 10hours or overnight in the freezer.