PLace lentils in to crock pot with curry powder, ground corriander, cumin seeds and stock. Cook on high for 2 hours.
Add the chicken to the crock pot. Cook on high for 3 hours.
Add the spinach to crock pot, cook for 30 mins. Stir in chopped corriander.
Season curry and serve with boiled rice and poppadums.
If you dont have a large slow cooker then all the spinach will not fit in, use thawed, well-drained frozed spinach instead.