Prep the chickpeas. Drain and rinse the chickpeas, then pat them dry with a clean kitchen towel.
Make the dressing. In a small bowl, whisk the olive oil, apple cider vinegar, Dijon mustard, oregano, maple syrup (if using) and salt until smooth.
Season the chickpeas. Pour the dressing over the chickpeas, toss well and let them sit for 5 minutes to absorb the flavors.
Chop the broccoli. Wash the broccoli and dry it thoroughly. Cut the florets into very small pieces, about ¼ to ½ inch (0.5–1 cm), or into thin slivers, so the dressing coats them evenly.
Prep the rest. Slice the apple thinly, halve the cherry tomatoes, finely chop the parsley and thinly slice the leek into rings.
Assemble. Lay the thin apple slices down as the base of the salad and reserve few slices for decoration. Add a layer of the chopped broccoli. Place the leek rings around the border of the plate as decoration. Spoon the seasoned chickpeas into the center.
Finish and serve. Arrange a few apple slices on top and the cherry tomatoes for a pretty presentation. Sprinkle with parsley and pour any remaining dressing over the top. Serve right away.