For Gulab Jamun
First, in a large pan add 1½ cups sugar and 1½ cups water. Sprinkle a little saffron or Kesar into the mixture, and bring to a boil. Stir well for 4 minutes or until the syrup becomes sticky. Turn off the flame and stir in cardamom powder and lemon juice. The sugar syrup is ready. Cover and let it cool down.
Take 1 cup of instant gulab jamun mix in a mixing bowl, add 2 tbsp of warm milk to it and combine the mixute to form a smooth dough.
Next, grease ghee to the hands, and make small balls of dough making sure it has no cracks.
Heat the ghee on a low flame and when the ghee is moderately hot, fry the jamuns on a low flame stirring in between. Fry them till the balls turn golden brown and keep it aside.
Once done, drop the jamuns into the sugar syrup. Cover the lid and let it sit for half an hour. Jamun doubles in size after absorbing the sugar syrup.
For Instant Rabri
Boil the milk in a heavy bottom pan till it is reduced to its half.
Cut the sides and grind the bread slices in a blender. Roast the ground bread in ghee slightly. Add it to the milk and mix well.
Now add milk powder and malai to it and mix well. Cook the mixtured on slow for 5 mins.
Add sugar to it and mix well until it dissolves completely. Finally, add chopped dry fruits and cardamom powder to it. Let it cool down completely.
For Swill Roll
Spread the ready Rabri in a tray, covered with butter paper, and set it in the refrigerator for one hour.
Once done, take out the refrigerated Rabri sheet and place the gulab jamun pieces in the centre. Now roll the Rabri sheet over the gulab jamuns, and cut the extra part of the Rabri sheet.
Roll it and freeze again for 20 mins. Then take out the ready swiss roll, cut them into slices and serve chilled.