“Definitely [refers to] Miracle Whip if by vintage you mean the 1970s or later. I am a longtime newspaper food editor and at that time, we would say salad dressing as a generic term rather than ...
The larger cans are simply filled with larger pear halves and less servings. Put a small dollop of MIRACLE WHIP in the hollow of each pear half. You can use mayo, but the salad dressing is better.