The phrase "a leaf of lettuce" is correct and usable in written English.
You can use it whenever you want to refer to a single piece of lettuce, such as in the sentence "I added a leaf of lettuce to the salad."
But it's not a leaf of lettuce: it's a shred.
Immature semislugs can be smaller than an uncooked grain of rice — easy to miss on a leaf of lettuce or kale.
The pattie is perfectly charred, a solitary square of unnaturally vibrant cheese sits on top beneath the classic burger support staff: a crew of pickles, a leaf of lettuce, and a slice each of tomato and onion.
The clever Thai chicken lettuce wrap consisted of a bowl of sautéed chicken, vegetables and pine nuts (seasoned like a moo shu dish) and a wedge of iceberg; spoon the mixture onto a leaf of lettuce, roll and munch.
For example, if we wanted to add a second layer with all of the ingredients in the sandwich, we would spread mustard and mayonnaise on top of our current sandwich, add a few tomato slices, add a leaf of lettuce, add a few strips of bacon, and finally add another piece of bread on the very top.
Spoon some filling into a leaf of iceberg lettuce, romaine -- even radicchio -- fold it and roll, and forget about other silverware.
Proper mayonnaise is so amazingly delicious: rich, but invigorating, too, especially with a boring bit of farmed fish, a dreary late summer potato, or a couple of hard-boiled eggs (the campaign for the return of that postwar classic, eggs mayonnaise, served with a splotch of paprika and a leaf of butter lettuce, starts here).
Most tables do not have grills for do-it-yourself barbecuing, but the kitchen makes kalbi (grilled beef short ribs) and deji bulgogi (grilled pork slices), eaten burrito style in a leaf of red lettuce flavored with garlic, shiso and chilies.
Once, watching Hunter eat a leaf of crunchy lettuce, he smiles.
The lunch ladies had been working with the same abysmal budgets and restrictive contracts that schools everywhere do, and not a leaf of local lettuce had landed on the lunch plate of a local school cafeteria in years.
For example, kalbi or bulgogi proved delightful when seasoned with a bit of chili paste and enfolded in a large leaf of lettuce with a scattering of rice and some bean sprouts for crunch.
