In a heavy pot, add the full fat milk, bring it to boil, reduce the heat and let simmer for 10-12 minutes.We dont want to thicken a lot else it will become rabri. Add condensed milk or sugar and mix well. Let simmer for another 5-7 minutes.
Once the milk looks velvety, switch off the stove. We dont want it to reduce or thicken a lot. Mix in the powdered pistachios,saffron & cardamom powder 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).
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 3-4 minutes and immediately add vinegar. Start stirring and keep going until the curds are formed and the milk whey is seperated. Strain the curdled milk through muslin/cheese cloth.Wash with some cold water to remove the taste of vinegar.
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 semolina. Set timer to 8 minutes.
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. Keep in mind that the chenna should not turn greasy. Every milk is different so adjust kneading time accordinly Bring it all together, form into a ball, cover and let rest for 10 minutes.
Pinch small size portions of the kneaded chenna and make smooth round balls. Flatten slightly into discs. The chenna patties will double in volume while cooking. Dont make too big.