Easy Chickpea Curry

From The Flexitarian Ingredients One onion 2 tbsp vegetable oil 4 cloves garlic, grated 2 tsp grated ginger 2 tbsp medium curry powder 15 oz can chickpeas, drained 15 oz can copped tomatoes 15 oz can coconut milk 125 g baby spinach 1/2 tsp garam masala Lemon juice to...