However, garum and ketchup are two different sauces unite by a long history. But today, the latter is viewed as bland, commonplace and a culinary atrocity, while the former is considered an exciting, exotic, and mysterious condiment.
As a matter of fact they represent two different eras: garum represents a bygone one that many historians wish was a culinary reality, and chefs nostalgically try to recreate; while ketchup is the epitome of modern commercial days that many gourmet chefs wish was history and try to get rid from their menu.
But both sauces have something in common: they have been surrounded by wrong myths. Garum, for instance, was neither invented by Romans nor did it disappear when Rome fell; and ketchup was neither invented by Americans nor, was in the beginning sweet, thick or tomato based.