When the milk is about to go bad..Bring milk to a boil in a big pan, and add lime juice. Stir till the milk separates, then strain out the paneer and let drain. Boil, peel and mash potatoes. Mix potatoes, paneer, corn starch, salt, chopped cilantro, finely chopped green chillies and a pinch of garam masala. Make small round koftas and fry on a slow-medium flame. For the gravy, blend together boiled onions, soaked cashewnuts and khuskhus, ginger-garlic paste and a green chilli. Heat oil, fry the white paste, add water, salt, sugar and cream and boil on a medium flame. Add koftas and serve.