Brown onion, garlic and ginger in the oil.
1 tbsp oil, 1 onion chopped, 2 cloves garlic, 1 tbsp lazy ginger
When browned, add the spices except the garam masala and stir fry for a couple of minutes.
0.5-1 tsp hot chilli powder, 2 tsp ground coriander, 1 tsp turmeric, grinding of salt or more to your taste
Add the passata.
500 g passata
Bring to the boil then reduce to a simmer. Add the garam masala.
1 tsp garam masala
Add the spinach and let it wilt. Stir to mix it in once wilted.
200 g spinach
Pour the mixture into your slow cooker.
Add the chopped chicken and combine with the sauce.
4 chopped chicken breasts
Cook on low for 6-7 hours.
Half an hour before the end, taste and add more garam masala if needed.
If you like, pull the chicken apart and stir into the sauce. This helps make the chicken go a bit further I find.
Serve with rice, poppadoms or naan bread and raita.