This is mild vegetarian Indian dish using palak (spinach) and paneer (an Indian cheese similar to cottage or ricotta) that I have always enjoyed. I haven't been able to nail it quite as well as a good Indian restaurant does but it makes for a pretty good staple vegetarian meal at home and is great for leftovers. The flavour also varies depending on the type of paneer you use and whether the spinach is in season.
If the sauce is too thick add water until you reach desired consistency - I like mine thick so I add minimal water during cooking.
You can omit the sour cream or yoghurt and substitute this for water instead (or just use a light variety of the cream/yoghurt)
I've made this a couple of times and it turned out great both times - very tasty, and quite easy to make. - 15 Apr 2011