Heat oil in a large pan and add onion or celery, cook slowly for a few minutes
Add garlic, ginger, cumin, trimeric and mustard seeds and cook for a further minute.
Add stock cubes and a large splash of water (don’t drown it) and stir till stock is dissolved
Stir in potatoes and chick peas until coated
Cover and cook for 8 to 10 mins
Check potatoes are ready (not too soft and mushy and not too hard) then add the spinach leave and let them wilt.
Take off the heat and serve with pilau rice poppadoms and naan bread