There is definitely an argument to be made that vinaigrette should be included in the mother sauces. In fact, vinaigrette-like sauces were common in the Middle Ages for every manner of fish, fowl or flour-footed animal. That being said, I think the hesitation to include them comes from the fact that they are very tenuous emulsions, ready to separate into their components in a heart beat (and, remember, once you add an egg yolk your sauce is no longer a vinaigrette but rather a mayonnaise); you can't boil them or reduce them; and they are aggressive, almost like condiments. If, indeed, a vinaigrette is more condiment-like than like a traditional sauce, it should probably be thought of as a condiment, brushed on foods rather than spooned on them as would be another mother sauce. |