Procedures:
1- Heat the oil in a non-stick pan and gently cook the sliced onions and crushed garlic until soft.
2- Add all of the remaining ingredients, except the chickpeas, along with a little water, cover and bring to a boil.
3- Simmer for 30 minutes. At this stage, the saucecan be liquidsed using a hand-held immersion blender or in a food processor or it can be served chunky.
4- Add the chickpeas and spinach to the pan, bring back to a boil and simmer for a couple of minutes, until the spinach is wilted and the chickpeas heated through.