As we are still building up our pantry of indian curry spices, we didn't have the kashmiri chilli, white poppy seeds, or black cardamom. We substituted the regular chili powder, and black poppy seeds, but simply omitted the black cardamom. I can only imagine how much better this will taste with all three of those in it.
Also, the original recipe called for raisins, but as I detest fruit in meat dishes, we didn't add them.