Chickpea Soup with Greens | The Fast 800

Name: Chickpea Soup with Greens | The Fast 800
Ingredients: Calories per serving 222; 1 tbsp olive oil; ½ red onion, chopped finely; ½ garlic clove, chopped finely; 1 celery stalk, sliced into 1/2cm or ¼ inch pieces; 1 carrot, thinly sliced into batons; ¼ tsp dried oregano; 1/8 tsp chilli flakes; Sea salt; Black pepper; 200g tinned chopped tomatoes; 200g tinned chickpeas, rinsed and drained; 500ml water; 30g spinach leaves; 50g silverbeet (swiss chard), tough stems removed, leaves roughly chopped