lettuce

Because radish greens are delicate in texture, they pair well with similar-textured greens rather than firm greens, like iceberg lettuce or romaine.

Not to be outdone, on Tuesday, McDonald’s announced the return of its beloved Snack Wrap, a simple chicken, cheese, lettuce and sauce combo rolled in a tortilla.

Like iceberg lettuce or American cheese, ranch has become shorthand for everything supposedly wrong with the national palate.

Lastly, you can’t beat a chilled sandwich, with dense, chewy bread that provides more resistance than a room temperature sandwich, often with crunchy lettuce and mayonnaise-laced fillings.

It was doctrine: a working theory of lettuce, complete with a taxonomy of inner versus outer leaves.