Chicken Tikka Masala

For the marinade:

4 chicken breasts, cubed

3 tbsp natural yogurt

2 tbsp garam masala

1 tbsp ground cumin

1 tbsp ground coriander

1 tbsp paprika

1 tbsp turmeric

2 tbsp olive oil

Juice of ½ lemon

Salt and pepper

For the sauce:

50g butter (divided into 2 x 25g)

1 bay leaf

3 garlic cloves, minced

1-inch piece fresh ginger, grated

2 medium onions, thinly sliced

1 tsp ground cinnamon

100ml water

3 tomatoes, diced

1 tbsp tomato purée

1 green chilli, finely chopped

1 tsp ground cumin

1 tsp ground coriander

1 tsp paprika

1 tsp garam masala

200ml chicken stock

100ml fresh cream