- Spoon off all but about 3 tablespoons of the chicken fat from the pan. Be careful not to remove the fond and juices (the fat is clear - the juices are opaque). 
- Place the skillet over medium heat. Add the onions. Cook until they start to brown. This should take around 5-7 minutes.  
- Add the garlic ginger paste. Fry, stirring constantly until it stops sputtering. That usually takes about a minute. 
- Reduce the heat to medium low. Add the fenugreek seed and stir. Cook about 30 seconds. 
- Add the 3 tsp (yes I know - that's one tablespoon)  tandoor masala, 1 and 1/2 tsp of kashmiri chili powder and 1/2 tsp of kosher salt. 
- Look at your pan. You will need some oil to fry the spices. A dry pan is a dangerous pan at this point. If it looks dry add a bit more oil. Toss in the tandoori masala/kashmiri chili/ salt mix, stir to thoroughly combine the spices and oil and cook, stirring constantly, for about 30-45 seconds. 
- Add the tomatoes and stir. Cook the resulting tomato, onion masala until the tomatoes start to break down. This should take about 5 minutes.  
- Add the coconut milk. Bring to a lively simmer and cook for 3 minutes.  
- Add the chopped baby spinach. Stir into the sauce and cook until the spinach is fully wilted. 
- Return the potatoes to the pot and simmer until the potatoes are warmed through. 
- To serve nap the plate or large bowl with a little sauce, place a few potatoes in the middle of plate and top with chicken.