A Salad Dressing Recipe to Rule Them All. Shake up a pint of classic vinaigrette once a week or so, nothing more than olive oil, vinegar, shallots and mustard, and stick it in the refrigerator. This dressing has never gone “off” or rancid, or failed to be anything but fragrant and delicious. The secret seems to be in the shallots, which continue to soften and sweeten in the vinegar for as long as you keep the dressing, adding a round, bright flavor for as long as you keep it around.