Spinach + Chickpea Curry

Name: Spinach + Chickpea Curry
Cuisine: European
Ingredients: 1/2 onion, peeled + chopped; 2 garlic cloves, peeled + halved; 1/2 thumb of fresh ginger, peeled + chopped; 4 large tomatoes, quartered; coconut oil; 1 tsp mustard seeds; 1 tsp coriander seeds; 1 tsp garam masala; 1/2 tsp turmeric; 1 tsp ground cumin; 1/2 tsp hot chilli powder; 2 portions of basmati rice; 400g (14.1oz) tin of chickpeas, drained + rinsed; 1/4 cup coconut cream, see notes; salt; 1/4 lemon, juice only; 100g (3.5oz) baby spinach; optional servings: sliced red onion, sliced cucumber + chopped coriander