Jools’ easy chicken curry

Name: Jools’ easy chicken curry
Cook time: 1 h 30 min
Total time: 1 h 30 min
Cuisine: Indian
Ingredients: 1 onion; 4cm piece of ginger; 2 cloves of garlic; olive oil; 2 tablespoons tikka masala paste; 3 tablespoons natural yoghurt; 2 tablespoons tomato purée; 8 skinless boneless higher-welfare chicken thighs; 1 x 400g tin chopped tomatoes; 1 x 400g tin green lentils; 1 x 400g tin light coconut milk; optional: 2 handfuls of baby spinach; 2 tablespoons quality mango chutney