Take a cheese cloth and pour the sour curd, tie and hang from your kitchen tap for 1 hour.
Now take the milk in a sauce pan and place on heat to boil. Add sugar. Boil the milk till the quantity becomes 1/4 of the original amount
Let the milk cool down. Now pre-heat the oven on 115°C. Now take a bowl and add the hung curd with the milk. Add the condensed milk , mango pulp and mix them all together very gently. Making sure there should be no lumps.
Take an ovenproof bowl and pour all the mixture and place the Aam Doi mixture inside the preheated oven for 1 hour or until the yogurt sets. When the yogurt is set, turn off the oven and leave the yogurt inside the oven one night.
In the morning remove the Aam Doi from the oven and place inside the refrigerator to chill. Then refrigerate for at least 4-5 hrs or more to set fully. Serve chilled.