Pop your chicken, tomato puree, chopped tomatoes, coriander powder, paprika, salt, chilli powder in the slow cooker. Melt 25g butter in a frying pan and fry off your onion until translucent and bit coloured. Add to other slow cooker also.
Cover and cook for 4 hours on medium.
Add cream, honey, butter, coriander and lemon juice and stir to combine.