Spinach, chickpea and potato curry

Name: Spinach, chickpea and potato curry
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: Indian
Ingredients: 1 onion, chopped; 3 cloves garlic, chopped; a thumb-sized piece ginger, chopped; 1 green chilli, chopped; 1 tbsp vegetable oil; 1 tsp ground cumin; 1 tsp ground coriander; 1 tsp ground turmeric; 400g tin chopped tomatoes; 400g salad potatoes (such as Charlotte) cut into chunks; 400g tin chickpeas, drained and rinsed; 100g spinach, chopped; Half lemon, juiced; 1 tsp garam masala; naans, to serve