Pressure cook sweet potato until just done. Dont overcook else it will be mushy peel and grate sweet potato. Keep it aside
Heat milk in a vessel and bring to boil
Add grated sweet potato and mix well
Add saffron and mix well. Cook until milk reduces to half
Add sugar and mix well
Add cardamom and rose water. Mix well
Heat ghee in a pan and fry cashews until golden brown
Add nuts to kheer and mix. Serve kheer warm or cold