simple vinaigrette. Olive oil, French mustard, vinegar, salt, pepper (garlic, shallots). depending on the salad it’s wine vinegar (red or white) or apple cider vinegar, Dijon or à l’ancienne mustard. if i feel fancy I’ll add some herbs (tarragon is great) or some egg yolk for extra creaminess.
there is a segment on German public TV if that’s any help https://www.zdf.de/dokumentation/zdfzeit/zdfzeit-tricks-der-lebensmittelindustrie-mit-sebastian-lege-104.html#xtor=CS5-95
(Starts at 13:15 min). from what i remember it shows the same pattern mentioned by other commenters. vegetable fats instead of milk, thickeners, stabilizers, artificial flavors.