This may be old news so forgive this newbie if it is, but I just came across a yellow gravy recipe from vahrehvah that looks interesting. I haven't had a chance to make it but perhaps others have seen it or tried it?

http://www.vahrehvah.com/indian-yellow-gravy-restaurant-style-korma-curry-mother-sauce#.VBnvcRa9Kc0

Grettings fellow curry lovers! I am a new member coming to you from the land of Minnesota, USA.
I've long been looking for recipes to try and create at home those wonderful curry house dishes and I'm glad to have found this forum!
  I suppose I'm not entirely sure what else to say other than I'm thrilled to be here and to start tying recipes!