For the vinaigrette, mix vinegar with mustard and salt and pepper and then gradually mix in the oil with a whisk. Pour the vinaigrette into the glass.
Put the chickpeas in a sieve and rinse well, then drain and pour into the glass. Wash the cucumber and dice it, wash the tomatoes in the same way, then quarter them and place on the chickpeas. Drain the olives, cut in half and add to the glass with the cleaned and finely chopped romaine lettuce. Wash and dry the parsley, plucked finely and add the crumbled feta cheese to the salad. Seal the jar and place in the refrigerator overnight
To serve, place the salad in a plate and mix it up loosely.