Spicy cod with chickpeas and spinach

Ingredients

• 2 tbsp olive oil
• 1 onion (finely chopped)
• 1 green chili pepper (deseeded and finely chopped)
• 2 carrots (peeled and diced)
• 2 stalks celery (diced)
• 1 1/2 oz fresh ginger (peeled and finely chopped)
• 2 garlic cloves (crushed)
• 6 green cardamom pods (crushed and pods discarded)
• 1 tsp ground turmeric
• 2 cups diluted salt-reduced or homemade fish or vegetable stock (hot)
• 1 398ml can chickpeas (drained and rinsed)
• 1 lb tomatoes (peeled and quartered)
• 1 cup frozen peas
• 21 oz skinless thick cod steak (cut into chunks)
• 1/2 lb baby spinach leaves