Next to my friends cooking range he has a number of metal containers attached to the wall, from memory these contained.
Methi,Salt,Chilli powder,Masala mix,Tomatoe Puree,Turmeric so these seem to be his main ingredients.
He also has a large jar of homemade Ginger/Garlic puree in oil on a shelf.
Also there are jars of homemade mixes he uses for various meals like balti's,korma's etc and surprisingly, (to me),quite a few of the Patak brand of pastes etc,when I asked him about those he said some were as good as he could make so saved him valuable time in the prep.