Once the chickpeas are cooked, you can add the greens to it. If using cabbage, shred it, boil it in a separate pot with a bit of salt and water and drain in a colander. Add a tsp of olive oil and some garlic chunks to the pot and when the garlic is slightly brown, add the cabbage and stir quickly. This can now be added to the chickpea pot or served on top.
If you are not too keen on cabbage or don't fancy spending much time on it, you can also add some washed baby spinach to the cooked chickpeas and boil for a few minutes, it's also very nice. Spoon ready!