Add spices to preheated slow cooker this is to allow them to heat and become fragrant.
Add the rest of the ingredients and cook on low for 6 hours.
Notes
This curry is not suppose to be spicy if you like your curries to have more of a kick just add more chilli.
You can use spinach instead of kale just add the spinach 10 minutes prior to serving .
You can also use chunks of lamb rump roast or lamb shanks instead of chops just cook for 6-8 hours on low.
If you find the sauce is a bit oily this can happen especially when using chump chops place a few slices of bread on top repeat this process and it should soak up most of the oil.
Passata is a thick tomato puree and can be found in your local supermarket in the same section as bolognaise sauces