CNN  —  The dish known as salad is said to date back to the ancient Roman habit of dipping romaine lettuce in salt — “herbe salata” means “salted leaves.” Now, centuries after the concept originated in Ancient Rome, salads may conjure for some an image of a tub of lettuce with choose-your-own mix-ins from ubiquitous salad chains; for others, it’s a warm bowl of grains (like farro salad) or a salad devoid of lettuce altogether (like a macaroni or potato salad, or cole slaw). Salad is considered

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