Kalakanth

Method : 

Boil milk on a low flame by stirring continuously. After 15 minutes, slowly add the citric acid dissolved in hot water. Stir continuously while adding it. When the mixture thickens (paste consistency), add sugar. If necessary, add cardamom powder. 

Remove from fire after 5 minutes and transfer the content evenly on a greased vessel. When cool, cut into desired shapes.