This tastes exactly like the dish that I always get at my favorite Indian restaurant. I made it up one day and everyone was shocked. It has quite the mix of ingredients, but they all play a key role in getting the taste and consistency that I was looking for.
Found this in a curry and chili cookbook. We actually didn't have any yoghurt the first time we made it. It was still great, just a little spicy. Edited the ingredients to change the amount of spinach - hopefully this amount will be more suitable :-)