Wash the potatoes well or peel them. Cut them into small pieces and boil in a large pot of water until tender.
Meanwhile, drain the chickpeas. Peel the onions and garlic, then chop and press them respectively.
Wash the celery and dill, then chop both of them finely. Wash the lemon and zest it. Afterwards, juice one half of it.
Mix the mayonnaise with the mustard, add the garlic and then the lemon juice and zest. Season with salt and pepper.
Drain the potatoes, let them steam dry briefly, and then put them in a large bowl. Fold in the dressing, onions, and dill. Season the salad one more time to taste.
Notes
Alternatively, the salad also tastes good with a vinegar-oil dressing.