In a heavy pot, add the full fat milk, bring it to boil, reduce the heat and let simmer for 25-30 mins until its reduced to 1/3 rd of its volume. We dont want to thicken a lot else it will become rabri. Add condensed milk or sugar and mix well. Let simmer for another 8-10 minutes.
Once the milk looks velvety, switch off the stove. We dont want it to reduce or thicken a lot. Mix in the nuts,saffron & cardamom while still warm, mix and cover the milk with a lid to let cool down for 15 minutes. Once a bit cooled mix in the mango pulp. Transfer to a wide dish(wide enough so that chenna discs can be soaked in milk in a single layer when we add them). Refrigerate to chill while we make chenna patties.
Make the Chenna
Set milk to a boil in a heavy pot. Line your colander with cheesecloth/muslin. Once the milk is boiling, switch off the flame,wait for a minute and immediately add vinegar to it followed by ice cubes. Stir gently 2-3 times. You will see that the milk starts curdling. Let the curds form, donâ€™t stir a lot. Once you see that all the milk has curdled and a greenish whey has separated, the ice cube would have melted awaty. Strain the curdled milk through a muslin/cheese cloth.Â
Pour some cold water to remove the traces of vinegar. Let water flow away for 3-4 minutes and then bring together ends of the cheesecloth and tie into a small pouch. Hang it for about 20-25 minutes over sink to remove some liquid from the chenna. When the liquid stops dripping, chenna is ready to knead.
Make the Chenna Patties
Transfer the chenna to a wide dish, add the cornstarch and using the base of your palm, knead the chenna for around 8 minutes to a smooth. Use the heel of your palm, press and push the chenna away from your while kneading it. By the end it will feel soft and creamy and come together in a soft dough. Bring it all together, form into a ball, cover and let rest for 10 minutes.
In a wide pot, add the sugar and water for the syrup, add the cardamom pods and set to bring it to a rolling boil.Â
Pinch small lime size portions of the kneaded chenna and make smooth round balls.Flatten slightly into discs.
Once the syrup is boiling, slowly add the chenna patties in there. Dont lower the heat. Once you have added all the patties, cover the pot and let boil vigrously for 10-12 mins.Â You will see that the patties will grown in size (almost double or more). Dont reduce the stive else thet will deflate.
After 10-12 minutes, when you see that the patties are firm, switch off the flame. Do not open the lid immediately. Let sit for 6-8 minutes. Add the ice cubes next and then let the patties soak in syrup for 1-2 hours.