Grate the pumpkin and squeeze the water from the pumpkin. Keep the water for cooking pumpkin
Add ghee to the pan and sauté the cashew nuts and raisin till cashew nuts are golden brown. Keep them aside
In the same pan add the pumpkin water and bring to boil. When you see bubbles, add the grated pumpkin and cook in a low flame. Cook the pumpkin in a low flame till it becomes soft
Add sugar and saffron strands. Continue cooking in medium flame
Add food color, salt and remaining ghee and continue cooking till you see glossy texture and halwa leave the sides. Add cashew nuts, raisins and cardamom powder and mix well. Halwa is ready to serve