Molded salad?

This was popular during the 1950's. It was a savory, rather than sweet, gelled molded salad, and had vegetables (celery, carrots, etc.) in it instead of fruit. It was a staple at church socials and family gatherings from Maine to Florida. I don't remember if it was made with plain gelatin or a flavored one, but I do remember that the recipe calls for vinegar.