More to explore:
Vintage Jello Ad
Old Fashioned Christmas Candy Recipes
Jell-O: America's Most Famous Dessert (CK0029) - Emergence of Advertising in America - Duke Libraries. Vintage Jello Recipes (not all are keto-friendly however)
...Jell-O remained a minor success until 1904, when Genesee Pure Food Company sent enormous numbers of salesman out into the field to distribute free Jell-O cookbooks, a pioneering marketing tactic at the time.