IN ITS SIMPLEST form, a vinaigrette, or French salad dressing, is one part vinegar or lemon juice to three or four parts olive or vegetable oil. It is seasoned with a little salt and pepper. Mixed extremely well just before using, the vinaigrette is smooth and delicate tasting; if not well blended, it can be harsh and oily. If the oil and vinegar used have excellent flavor, nothing else is needed to dress a mixed green salad.
Dijon mustard is used as a basic vinaigrette ingredient b