Slow-cooker butter chicken

Name: Slow-cooker butter chicken
Prep time: 25 min
Cook time: 7 h
Total time: 7 h 25 min
Cuisine: Indian
Ingredients: 500g skinless boneless chicken thighs, cut into 3 pieces; 1 lemon, juiced; 2 tsp ground cumin; 2 tsp paprika; 1-2 tsp hot chilli powder; 200g natural yogurt; 2 tbsp butter, ghee or vegetable oil; 1 large onion, chopped; 3 garlic cloves, crushed; 1 green chilli, deseeded and finely chopped (optional); thumb-sized piece ginger, grated; 1 tsp garam masala; 2 tsp ground fenugreek; 3 tbsp tomato purée; 250ml chicken stock; 50g flaked almonds, toasted; cooked basmati rice; naan bread; mango chutney or lime pickle; fresh coriander; lime wedges