Yeah, Waris is the place I had in mind. Never disappointed. I was actually after this spice mix on recommendation for today’s curry and only had time to go to the Lea Bridge Rd places near Markhouse Rd (got the mutton from Haji’s and it was excellent). I bet Waris has this.
I like Waris and Star Nergiz, both on Hoe St.
Waris has great lamb / mutton. Judging by the truck which pull up there once a week, it's from Cornwall.