Whisk the eggs, add cumin, yellow chilli powder, white pepper powder and oil. Add to the mince and mix well. Set aside for 10 minutes. Add cashew nuts, ginger, onions, coriander and garam masala. Mix well. Divide into 10 equal portions. Wrap two portions along each skewer using wet hands. Keep 2 inches between each portion. Like this prepare five skewers. Roast in a moderately hot tandoor or charcoal grill till golden brown, about 6 minutes or roast in a preheated oven at 300 ºF for 8 minutes. Baste once with oil. Remove from skewers and brush with white butter.