Lamb chickpea curry

Name: Lamb & chickpea curry
Ingredients: olive oil; 300 g diced lean lamb shoulder; 1 tesapoon mustard seeds; ½ teaspoon ground turmeric; 1 teaspoon chilli powder; 1 tablespoon Madras curry powder; 5 cm piece of ginger; 4 cloves of garlic; 3 onions; 10 curry leaves; 2 x 400 g tins of chickpeas; 1 organic vegetable stock cube; 1 x 400 g tin of quality plum tomatoes; ½ x 400 g tin of light coconut milk; 200 g baby spinach; 1 bunch of fresh coriander